Skip to main content

Table 2 Presence of distributional assessments of the primary outcome in 264 RCTs

From: Estimates of the mean difference in orthopaedic randomized trials: obligatory yet obscure

The category of distribution presentation on the primary outcome data Numbera of RCTs (%)
Only mean (SD) or median (IQR) or range provided 209 (79 %)
Reported one or more of the assessments categorized as below 58 (16 %)
 Categories 19 (7 %)
 Box-plots 19 (7 %)
 Patient-level change for all patients 2 (1 %)
 Number of observations at ceiling minimum or maximum value of the PROM 2 (1 %)
 Number of ‘outliers’ 8 (3 %)
 Number of ‘responders’ 3 (1 %)
 Number of patients ‘gained’ MIC or MDC 3 (1 %)
 Scatter plot of observations 1 (0.4 %)
  1. Footnotes: aRCTs reporting information on multiple categories of distribution presentations were counted for each category provided. SD standard deviation; IQR intra-quartile range; PROM patient-reported outcome measure; MIC minimal important change; MDC minimal detectable change