Missing data frequency and correlates in two randomized surgical trials for urinary incontinence in women.

Abstract:

INTRODUCTION AND HYPOTHESIS:Missing data is frequently observed in clinical trials; high rates of missing data may jeopardize trial outcome validity. PURPOSE:We determined the rates of missing data over time, by type of data collected and compared demographic and clinical factors associated with missing data among women who participated in two large randomized clinical trials of surgery for stress urinary incontinence, the Stress Incontinence Surgical Treatment Efficacy Trial (SISTEr) and the Trial of Midurethral Sling (TOMUS). METHODS:The proportions of subjects who attended and missed each follow-up visit were calculated. The chi-squared test, Fisher's exact test and t test were used to compare women with and without missing data, as well as the completeness of the data for each component of the composite primary outcome. RESULTS:Data completeness for the primary outcome computation in the TOMUS trial (62.3%) was nearly double that in the SISTEr trial (35.7%). The follow-up visit attendance rate decreased over time. A higher proportion of subjects attended all follow-up visits in the TOMUS trial and overall there were fewer missing data for the period that included the primary outcome assessment at 12 months. The highest levels of complete data for the composite outcome variables were for the symptoms questionnaire (SISTEr 100 %, TOMUS 99.8%) and the urinary stress test (SISTEr 96.1%, TOMUS 96.7%). In both studies, the pad test was associated with the lowest levels of complete data (SISTEr 85.1%, TOMUS 88.3%) and approximately one in ten subjects had incomplete voiding diaries at the time of primary outcome assessment. Generally, in both studies, a higher proportion of younger subjects had missing data. This analysis lacked a patient perspective as to the reasons for missing data that could have provided additional information on subject burden, motivations for adherence and study design. In addition, we were unable to compare the effects of the different primary outcome assessment time-points in an identically designed trial. CONCLUSIONS:Missing visits and data increased with time. Questionnaire data and physical outcome data (urinary stress test) that could be assessed during a visit were least prone to missing data, whereas data for variables that required subject effort while away from the research team (pad test, voiding diary) were more likely to be missing. Older subjects were more likely to provide complete data.

journal_name

Int Urogynecol J

authors

Brubaker L,Litman HJ,Kim HY,Zimmern P,Dyer K,Kusek JW,Richter HE,Stoddard A,Urinary Incontinence Treatment Network.

doi

10.1007/s00192-015-2661-5

subject

Has Abstract

pub_date

2015-08-01 00:00:00

pages

1155-9

issue

8

eissn

0937-3462

issn

1433-3023

journal_volume

26

pub_type

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