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Ann Coloproctol > Volume 35(6); 2019 > Article
Ramage, Qiu, Yeap, Simillis, Kontovounisios, Tekkis, and Tan: Anorectal Manometry Versus Patient-Reported Outcome Measures as a Predictor of Maximal Treatment for Fecal Incontinence

Abstract

Purpose

This study aims to establish the ability of patient-reported outcome measures (PROMs) and anorectal manometry (ARM) in predicting the need for surgery in patients with fecal incontinence (FI).

Methods

Between 2008 and 2015, PROMs data, including the Birmingham Bowel and Urinary Symptoms Questionnaire (BBUSQ), Short Form 36 (SF-36), Wexner Incontinence Score and ARM results, were prospectively collected from 276 patients presenting with FI. Spearman rank was used to assess correlations between specific PROMs questions and ARM assessments of sphincter motor function. Binomial regression analyses were performed to identify factors predictive of the need for surgery. Finally, receiver operating characteristic (ROC) curve analyses were performed to establish the utility of individual ARM and PROMs variables in predicting the need for surgical intervention in patients with FI.

Results

Two hundred twenty-eight patients (82.60%) were treated conservatively while 48 (17.39%) underwent surgery. On univariate analyses, all 4 domains of the BBUSQ, all 8 domains of the SF-36, and the Wexner Incontinence Score were significant predictors of surgery. Additionally, maximum resting pressure, 5-second squeeze endurance, threshold volume, and urge volume were significant. On ROC curve analyses, the only significant ARM measurement was the 5-second squeeze endurance. PROMs, such as the incontinence domain of the BBUSQ and five of the SF-36 domains, were identified as fair discriminators of the need for surgery.

Conclusion

PROMs are reliable predictors of maximal treatment in patients with FI and can be readily used in primary care to aid surgical referrals and can be applied in hospital settings as an aid to guide surgical treatment decisions.

INTRODUCTION

Fecal incontinence (FI) is defined as the involuntary loss of liquid and/or solid stool through the anus [1]. Its prevalence is likely underestimated due to underreporting by its sufferers, but is quoted to be in the region of 7.7% (range, 2.0%–20.7%) [2]. The presence of FI has a major negative impact on physical and psychological health and on lifestyle; in many cases, it can lead to severe social restrictions. Treatment ranges from conservative treatments such as lifestyle adaptations, stool-bulking agents, biofeedback, sphincter exercises, and transanal irrigation to more invasive procedures such as sacral nerve stimulation (SNS) and sphincter repair [3].
Anorectal manometry (ARM) has long been used as part of the diagnostic work-up in the assessment of patients with FI. Several parameters, including the resting pressures (RPs) of the anal canal, maximal squeeze pressure increment (MSPI), squeeze endurance (SE), and measurements of rectal sensitivity, are routinely assessed in patients with FI who are referred to pelvic-floor specialists. Nevertheless, the diagnostic accuracy of ARM for patients with FI remains unclear. The sensitivity and the specificity in diagnosing FI varies significantly between studies, and whether any correlation exists between ARM measurements and the severity of symptoms is unclear. Overall, how ARM influences clinical decision making as to the most appropriate treatment for patients is still unclear.
For the above reasons, this study aimed to assess the ability of ARM, compared to patient-reported outcomes, in predicting the need for surgical intervention in patients suffering with FI. Additionally, this study also aimed to ascertain the degree of correlation between patient-reported outcome measures (PROMs) and ARM measurements specific to external and internal anal sphincter function.

METHODS

Data were prospectively collected between 2008 and 2015 from adult patients undergoing assessment of and treatment for FI at a single center specializing in the management of pelvic-floor disorders. Ethical approval was granted by the Bristol NRES Committee (14/SW/0051) for the maintenance of a research database with prospective patient consent for data inclusion. Prior to this data was collated as part of ongoing clinical care and to assess response to treatment and stored anonymously for audit purposes. At the first consultation, patients underwent clinical assessments, including the use of several validated PROMs questionnaires, in addition to physical examinations and ARM measurements. Additionally, patients underwent endoanal sphincter ultrasound assessments to determine whether any anal sphincter defects were present.
All patients diagnosed with FI were initially referred for pelvicfloor physiotherapy (biofeedback) and/or started on stool-bulking agents (e.g., loperamide). Patients were followed up at 6- to 12-month intervals. Patients were discharged if FI symptoms were sufficiently managed. Patient who had significant and persistent symptoms were considered for either SNS or surgical sphincter repair as per National Institute of Clinical Excellence guidelines for the management of FI in adults [3].
Patients were included in this study if they had recorded data within the database from an initial consultation within the pelvicfloor clinic and prior to any interventions taking place. The exception to this was patients who had sustained an obstetric anal sphincter injury (OASI); invariably, such patients had received some general pelvic-floor physiotherapy prior to consultation with a pelvic-floor colorectal surgeon. Patients had to have undergone an ARM assessment of sphincter function, with completion of at least one PROM questionnaire (WIS, BBUSQ, and SF-36).
The primary outcome measure was whether patients required only conservative treatment or additional surgery (in the form of either SNS or sphincter repair). The secondary outcome measure was the degree of correlation between commonly used ARM parameters, which are considered as markers of internal or external sphincter motor function, and specific patient symptoms relating to abnormalities of internal and external sphincter function. The latter was assessed in order to determine whether specific question stems detailed within the BBUSQ had the potential to act as surrogate markers in the community for the likelihood of achieving poor ARM results.

Patient-reported outcome measures

PROM measures were collected for research purposes only and were not readily available to the clinical team; therefore, individual questionnaire responses were not used in clinical decisionmaking. Rather, decisions regarding appropriate steps of care were based upon both a clinical review of symptoms, both subjectively and objectively, and a review of ARM, Endoanal ultrasound and other imaging results. Patients were asked to complete 2 clinically validated symptoms questionnaires, the Birmingham Bowel and Urinary Symptoms Questionnaire (BBUSQ) [4] and Wexner Incontinence Score (WIS) [5], prior to the initial clinical assessment. The BBUSQ score evaluated the severity of pelvic-floor symptoms through the assessments of four major symptom domains (constipation, FI, fecal evacuatory disorder, and urinary symptoms). Scores for each of the four domains were quantified as scores out of 100, with a higher score indicating worse symptom severity. The WIS, marked out of 20, quantified the severity of FI, with a higher score indicating worse symptoms.
The Short Form 36 (SF-36) quality of life (QoL) score was also collected [6]. This has 8 scoring domains, including vitality, physical functioning, bodily pain, general health perceptions, physical role functioning, emotional role functioning, social role functioning, and mental health. Each domain is scored out of 100, with a higher score indicating a better QoL. Functional and QoL data collected as detailed above were anonymized and entered into the prospectively maintained pelvic-floor research database.

Anorectal manometry

After the patients had given informed consent, they were positioned in the left lateral position. ARM was carried out using the T-DOC Air-Charged ARM Catheters (LABORIE International, Mississauga, ON, Canada), which have four pressure sensors measuring 4 quadrants of the anal sphincter, plus a distal balloon that can be filled to obtain sensory responses from the patients. The pressure sensors were connected to the Delphis IP processor (LABORIE International), which served to pump air to prime the catheters and to digitize and record pressure readings from the pressure sensors. Digital rectal examination was performed prior to introduction of the ARM catheter into the anal canal.
The maximal RP was recorded at the level of the high-pressure zone. The patients were then asked to squeeze their anal sphincter as hard as they could in order to determine the MSPI and then to squeeze and hold for 5 seconds to determine the SE. A mean of three readings was taken for each of the motor function parameters. Rectal sensation was measured by inflating a balloon on the catheter’s tip with air while it was being placed within the rectum. The threshold volume (TV), the volume to defecatory urge, and the maximal tolerated volumes were measured. The rectal anal inhibitory reflex was assessed by inflating the intrarectal balloon with 50 mL of air. Although newer ARM modalities became available during the study period, all patients in this study underwent manometry using the calibrated air-filled system to ensure consistency throughout the study group.

Statistical methods

Demographic data from patients who required surgical treatment were compared with the corresponding data from those who did not by using the chi-square test for categorical data, the unpaired t-test for parametric variables and the Whitney-Man U-test for nonparametric variables. Binary logistical regression analyses were performed for ARM, BBUSQ, and SF-36 scores to determine significant variables for determining the maximal treatment required. A P-value of < 0.05 was considered to be statistically significant.
The predictive abilities of ARM measurements, BBSUQ domains, WIS, and SF-36 domains were assessed by constructing receiver operating characteristic (ROC) curves, with the outcome measure being whether a patient required surgical treatment for FI (SNS and other surgery). The optimum cutoff for each variable, and its respective sensitivity and specificity were determined by calculating the Youden Index for each ROC curve [7]. ROC curves for which the area under the curves (AUCs) were greater than 0.7 were deemed to be fair discriminators of the need for maximal treatment in patients with FI.

RESULTS

Between 2008–2015, 432 patients were assessed with FI. Of those, 156 patients were excluded due to incomplete data. Therefore, a total of 276 patients were included in this analysis. The patient population was predominantly female (248 females vs. 28 males). The mean overall age of the group was 43.59 years. Sphincter weakness was the major etiology (79.3% of all patients), predominantly secondary to prior obstetric trauma. Two hundred twentyeight patients (82.6%) received only conservative treatment while 48 (17.4%) underwent surgical intervention, either in the form of SNS or sphincter reconstructive surgery (Table 1). Sixty patients (21.7%) received no further treatment after initial consultation with the colorectal pelvic-floor team; the vast majority of those were patients who were assessed following OASI and had received some form of generalized pelvic-floor physiotherapy during their recovery period. Increasing age and male gender were found to be significant risk factors for undergoing surgical intervention. In terms of etiologies, significant differences were found in the proportions of patients with OASI and those who had undergone rectal resection between the conservative-treatment and the surgical groups (Table 2).
The RP was significantly lower in the surgery group (P = 0.001); however, no statistically significant differences in the other anorectal physiology parameters were found between the groups (Table 3). Age, all domains of the BBSUQ and the SF-36, and the WIS had significant differences in the mean scores between the conservative-treatment and the surgical groups.

Logistic regression analysis

Binomial logistic regression analyses were performed using continuous data for each of the variables (Table 4).
Of the ARP results, maximum RP (P = 0.001), 5-second squeeze increment (P = 0.017), TV to distension (P = 0.043), and urge volume to distension (P = 0.033) were found to be statistically significant. Of the remaining parameters, age, sex, the WIS, and all domains of the BBSUQ and SF36 were found to have regression significance.

Receiver-operator curve analysis

ROC curve analyses were performed on the variables to determine their abilities to predict maximal treatment. Variables with an AUC of greater than 0.7 were interpreted as being fair predictors of the need for surgical intervention (Table 5). On ROC curve analyses, the only ARM parameter that had an AUC greater than 0.7 was the 5-second squeeze increment. Patient age, the incontinence domain of the BBUSQ, and 5 domains of the SF-36 (physical function, physical role, mental health, social function, and general health) were shown to have AUCs of greater than 0.7. The evacuatory domain of the BBUSQ and the WIS had AUCs that were just slightly less than 0.7.
The Youden index was then used to calculate the optimum cut-off points for each of the variables to obtain the highest sensitivities and specificities [7]. A 5-second squeeze increment of less than 16.5 mmHg had a sensitivity of 81.8% and a specificity of 70.3% in detecting the need for surgical intervention while a SF36 social function domain score of less than 68.75/100 had a sensitivity of 80% and a specificity of 69.7%. A BBUSQ incontinence domain score of 39.58 or above had a sensitivity of 65.1% and specificity of 70.1% in the detection of the need for surgical treatment. AUC plots for age, 5-second squeeze increment, BBUSQ Incontinence domain, and SF-36 social function domain are shown in Fig. 1.

DISCUSSION

This is, to our knowledge, the first study to attempt to use ARM results to predict the need for surgical intervention in patients with FI. Within our series, on the univariate binomial regression analyses, a number of factors were statistically significant in the prediction of the need for surgery in FI patients. With regards to sphincter motor function, the resting pressure and the 5-second squeeze increment were significant. On sensory-function testing, threshold and urge volumes were also significant. All parameters of different PROMs were significant. When ROC analyses were performed, the majority of ARM measurements taken had a low sensitivity and specificity in the prediction of the need for sphincter repair or SNS in patients with FI. The only factor that appeared to be indicative of the need for intervention was a poor endurance squeeze pressure (SP) increment.
Few studies in the literature report on attempts to use ARM in the prediction of maximal treatment for patients with FI. Hill et al. [8] studied a group of 35 patients referred for investigation of FI. They found no correlation of either ARM or endoanal ultrasound with clinical outcome. A small number of studies aimed to predict the presence or severity of anal incontinence. Pehl et al. [9] undertook a study of 144 healthy volunteers and 559 incontinent patients with varying severities of incontinence (gas, liquid stool, solid stool) and compared motor and sensory functions to severity of incontinence. They found significant differences in the mean RP, mean SP and volume to urge in FI patients, and they showed that overall, ARM had a sensitivity of 91.4%, a specificity of 63.2% and a diagnostic accuracy of 85.8% in prediction of the presence of FI. Felt-Bersma et al. [10] demonstrated that the mean SP was the most discriminatory of all measurements used in the prediction of FI; however, for all measurements, an almost complete overlap with the measurements for patients without incontinence and healthy volunteers was found. Lam et al. [11] undertook a comprehensive study of 600 patients, with the aim of identifying predictive factors for FI. They found that a reduced mean RP and a reduced mean SP were significantly associated with the presence of FI in both males and females. Additionally, in females, a shorter sphincter length and a lower rectal capacity were associated with FI. In a similar vein, Roos et al. [12] in their study of 159 patients with OASI found no significant difference in functional incontinence scores in women with and without evidenced sphincter defects. They also found no correlation between endoanal ultrasound results and functional incontinence scores. They used ROC analyses to determine cutoff manometric values for the detection of anal sphincter defects and reported that a mean RP of 95 mmHg and a mean squeeze increment of 53 mmHg would allow 90% of all sphincter defects to be detected. Reddymasu et al. [13] in their cohort study of 27 patients found that ARM in combination with the use of endoanal ultrasound was useful in detecting an abnormality in 25 of 27 patients.
The main limitation of this study is that the predominant etiology of FI in this patient population is OASI; however, the proportions seen within this research are representative of the general case mix presenting to a tertiary pelvic-floor service. Additionally, patient involvement and completion of PROMS were entirely voluntary; therefore, a degree of reporting bias may exist as those who completed the PROMs may have been more motivated to do so due to their symptoms being worse and may have had a greater desire to relay this to the clinical team. Additionally, meaningful multivariate logistic regression analyses could not be performed on the data due to the low ratio of positive events to the number of significant factors on the univariate analyses. Another potential limitation was the use of an air-perfused catheter ARM system, which had been in use since the development of the local Pelvic Floor Service. Other more widely accepted ARM systems exist, however the air-perfused system has been demonstrated to have comparable performance to water-perfused and solid state systems [14]. Therefore its use throughout this research was continued to allow for consistency in methodology within this patient cohort.
In conclusion, PROMs, which are inexpensive and easily performed, are reliable predictors of maximal treatment in patients with FI and can be readily used both in primary care to aid surgical referrals and in hospital settings, in conjunction with only the sustained SP in ARM, to guide surgical management. Additionally, within our series, BBUSQ assessments of IAS and EAS functions through reporting of symptoms of fecal urgency, inability to defer defecation, and passive FI were found to correlate with ARM evidence of sphincter disruption. Therefore, the absence of these key symptoms may be a useful indicator in determining those who do not need full manometric sphincter assessments. Simple questionnaires assessing the degree of dysfunction and impact on QoL, such as the ones described above, may be useful for general practitioners in the community and specialists in referral centers to allow triage of patients with less severe symptoms who would benefit from conservative treatment in the form of physiotherapy, ultimately reducing the burden on tertiary-level care.

CONFLICTS OF INTEREST

No potential conflict of interest relevant to this article was reported.

Fig. 1.
Receiver operating characteristic (ROC) curves with areas under the curves values > 0.7: age (A), 5-second squeeze increment (B), Birmingham Bowel and Urinary Symptoms Questionnaire (BBUSQ)-fecal incontinence domain (C), and Short Form 36 (SF-36) social function score (D).
ac-2018-10-16f1.jpg
Table 1.
Numbers of patients undergoing conservative and surgical management
Treatment No. of patients
Conservative
 None 60
 Biofeedback 152
 Transanal irrigation 16
Surgical
 Sacral nerve stimulation 37
 Other surgery 11
Total 276
Table 2.
Patients’ demographics
Variable Maximal treatment
P-value
Conservative (n = 228) Surgical (n = 48) All/total (n = 276)
Sex, female : male 211 : 17 37 : 11 248 : 28 0.001*,a
Age (yr) 41.25 ± 14.30 54.63 ± 15.11 43.59 ± 15.28 0.000*,b
Etiology
 Sphincter weakness
  Postsurgical sphincter injury 7 (3.07) 3 (6.25) 10 (3.62) 0.386*
  Obstetric sphincter injury 170 (74.56) 23(47.92) 193 (69.93) 0.001*,a
  Sphincter defect unknown etiology 1 (0.44) 1 (2.08) 2 (0.72) 0.318*
  No sphincter defect 11(4.82) 2 (4.17) 13 (4.71) 1.000*
 Neuropathic/CNS 8 (3.51) 1 (2.08) 9 (3.26) 1.000*
 Proctitis 2 (0.88) 1 (2.08) 3 (1.09) 0.438*
 Structural pelvic floor abnormality (e.g., intussusception) 9 (3.95) 1 (2.08) 10 (3.62) 1.000*
 Prior rectal resection (e.g., anterior resection) 5 (2.19) 10 (20.8) 15 (5.43) 0.000*,a
 Paradoxical puborectalis contraction 2 (0.88) 0 (0) 2 (0.72) 1.000*
 Idiopathic 13 (5.70) 6 (12.5) 19 (6.88) 0.099*,a

Values are presented as mean ± standard deviation or number (%).

CNS, central nervous system.

* P < 0.05.

a Fisher exact test.

b Mann-Whitney U-test.

Table 3.
Means and standard deviations of patients’ variables for different treatment groups
Variable Conservative Surgical P-valuea
Age (yr) 41.25 ± 14.3 54.63 ± 15.1 0.000*
Anorectal manometry
 Anal canal length (cm) 2.94 ± 0.4 3.01 ± 0.2 0.170
 Maximum resting pressure (mmHg) 61.68 ± 18.6 51.98 ± 17.2 0.001*
 Maximum squeeze increment (mmHg) 35.21 ± 29.8 29.87 ± 22.2 0.245
 5-sec squeeze increment (mmHg) 27.59 ± 19.1 21.46 ± 6.8 0.054
 Involuntary cough pressure (mmHg) 46.17 ± 23.9 44.10 ± 15.5 0.623
 Threshold volume to distension (mL) 31.18 ± 12.6 36.42 ± 23.3 0.217
 Urge volume to distension (mL) 56.49 ± 18.8 63.50 ± 25.1 0.119
 Maximum tolerated volume (mL) 100.56 ± 28.7 104.48 ± 35.4 0.962
BBUSQ
 Constipation 54.07 ± 36.9 44.90 ± 20.3 0.019*
 Incontinence 29.18 ± 17.7 46.06 ± 25.0 0.000*
 Evacuatory 13.89 ± 11.5 20.73 ± 11.6 0.000*
 Urinary 19.68 ± 12.8 27.18 ± 19.0 0.028*
WIS 6.24 ± 3.4 8.96 ± 4.7 0.000*
SF-36
 Physical function 83.30 ± 22.2 63.77 ± 31.7 0.000*
 Role physical 78.62 ± 24.2 58.33 ± 32.6 0.000*
 Role emotional 86.35 ± 23.16 69.10 ± 32.7 0.000*
 Vitality 54.07 ± 17.2 45.40 ± 21.5 0.001*
 Mental health 73.79 ± 15.8 59.26 ± 21.6 0.000*
 Social function 76.40 ± 21.9 51.30 ± 27.4 0.000*
 Pain 75.08 ± 22.7 63.28 ± 29.1 0.018*
 General health 68.33 ± 18.1 55.08 ± 20.8 0.000*

BBUSQ, Birmingham Bowel and Urinary Symptoms Questionnaire; WIS, Wexner Incontinence Score; SF-36, Short Form 36, quality of life questionnaire.

* P < 0.05.

a Mann-Whitney U-test.

Table 4.
Binomial logistic regression analysis of patients’ variables
Variable SE Wald P-value Odds ratio 95% CI
Age 0.010 26.417 0.000* 1.054 1.033–1.075
Male sex 0.426 9.392 0.002* 3.690 1.601–8.505
ARM
 Anal canal length (cm) 0.536 1.901 0.168 2.094 0.732–5.988
 Maximal resting pressure (mmHg) 0.010 10.334 0.001* 0.969 0.950–0.988
 Maximal squeeze increment (mmHg) 0.007 1.371 0.242 0.992 0.979–1.005
 5-sec squeeze increment (mmHg) 0.018 5.659 0.017* 0.959 0.927–0.993
 Cough pressure (mmHg) 0.008 0.328 0.567 0.996 0.981–1.011
 Threshold volume to distension (mL) 0.009 4.091 0.043* 1.019 1.001–1.037
 Urge volume to distension (mL) 0.007 4.535 0.033* 1.015 1.001–1.029
 Maximal tolerated volume (mL) 0.005 0.679 0.410 1.004 0.994–1.014
BBUSQ
 Constipation 0.009 7.023 0.008* 0.975 0.958–0.994
 Incontinence 0.008 24.097 0.000* 1.039 1.024–1.056
 Evacuatory 0.012 12.129 0.000* 1.044 1.019–1.070
 Urinary 0.010 10.071 0.002* 1.032 1.012–1.053
WIS 0.039 16.702 0.000* 1.171 1.086–1.263
SF-36
 Physical function 0.006 20.704 0.000* 0.975 0.965–0.986
 Role physical 0.005 19.874 0.000* 0.977 0.966–0.987
 Role emotional 0.005 15.679 0.000* 0.979 0.969–0.989
 Vitality 0.008 8.544 0.003* 0.976 0.961–0.992
 Mental health 0.009 21.321 0.000* 0.961 0.945–0.977
 Social function 0.006 33.051 0.000* 0.963 0.951–0.976
 Pain 0.006 8.920 0.003* 0.982 0.970–0.994
 General health 0.008 17.164 0.000* 0.968 0.953–0.983

SE, standard error; CI, confidence interval; ARM, anorectal manometry; BBUSQ, Birmingham Bowel and Urinary Symptoms Questionnaire; WIS, Wexner Incontinence Score; SF-36, Short Form 36, quality of life questionnaire.

* P < 0.05.

Table 5.
ROC curve analyses of patients’ variables
Variable AUC SE P-value 95% CI Cutoff [7] Sensitivity Specificity
Age 0.748a 0.039 0.000 0.672–0.823 37.61 0.854 0.573
ARM
 Anal canal length (cm) 0.539 0.042 0.391 0.457–0.622 2.75 0.979 0.127
 Maximal resting pressure (mmHg) 0.648 0.043 0.001 0.563–0.732 56.00 0.667 0.583
 Maximal squeeze increment (mmHg) 0.556 0.046 0.225 0.465–0.647 27.50 0.604 0.531
 5-sec squeeze increment (mmHg) 0.762a 0.066 0.005 0.633–0.891 16.50 0.818 0.703
 Involuntary cough pressure (mmHg) 0.555 0.115 0.606 0.330–0.780 36.50 0.625 0.588
 Threshold volume to distension (mL) 0.405 0.071 0.179 0.267–0.544 41.00 0.571 0.253
 Urge volume to distension (mL) 0.354 0.070 0.058 0.216–0.492 52.00 0.294 0.500
 Maximal tolerated volume (mL) 0.481 0.136 0.857 0.214–0.747 102.50 0.625 0.446
BBUSQ
 Constipation 0.386 0.053 0.022 0.282–0.490 44.17 0.452 0.315
 Incontinence 0.717a 0.047 0.000 0.625–0.809 39.58 0.651 0.707
 Evacuatory 0.698 0.043 0.000 0.614–0.782 17.71 0.690 0.713
 Urinary 0.615 0.052 0.021 0.512–0.718 32.14 0.429 0.828
WIS 0.696 0.050 0.000 0.598–0.795 8.50 0.649 0.693
SF-36
 Physical function 0.701a 0.047 0.000 0.608–0.794 67.50 0.575 0.778
 Role physical 0.704a 0.047 0.000 0.611–0.797 71.88 0.700 0.707
 Role emotional 0.673 0.051 0.001 0.574–0.772 79.17 0.684 0.646
 Vitality 0.644 0.053 0.005 0.540–0.747 53.13 0.725 0.575
 Mental health 0.730a 0.043 0.000 0.645–0.815 67.50 0.700 0.675
 Social function 0.787a 0.038 0.000 0.712–0.862 68.750 0.800 0.697
 Pain 0.627 0.052 0.014 0.525–0.728 53.130 0.500 0.787
 General health 0.709a 0.046 0.000 0.618–0.800 57.500 0.632 0.743

ROC, receiver operating characteristic; AUC, area under curve; SE, standard error; CI, confidence interval; ARM, anorectal manometry; BBUSQ, Birmingham Bowel and Urinary Symptoms Questionnaire; WIS, Wexner Incontinence Score; SF-36, Short Form 36, quality of life questionnaire.

a AUC > 0.7.

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