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Table 1 Outcome measure analysis methods

From: Weekly group tummy time classes are feasible and acceptable to mothers with infants: a pilot cluster randomized controlled trial

Outcome measure Analysis method
Primary outcomes—feasibility and acceptability
 Recruitment and retention Descriptive statistics (n, %)
 Usefulness and relevance Descriptive statistics (n, %), Pearson chi square
 Engagement in social media Descriptive statistics (n, %), Pearson chi square
 Wearing the GENEActiv Descriptive statistics (n, %)
Secondary outcomes—potential efficacy
 Amount of tummy time and adherence to the 24-h movement guidelines Descriptive statistics (n, %), linear mixed models (group, time, group × time, sex), Cohen’s d
 Motor development and head shape Descriptive statistics (n, %), linear mixed models (group, time, group × time, sex), Cohen’s d
 Personal, behavioral, and environmental factors Descriptive statistics (n, %), linear mixed models (group, time, group × time, sex), Cohen’s d
  1. n number, % percentage