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Table 4 Within-practice participant recruitment timeframe by participant recruitment/randomisation factors

From: Evaluation of different recruitment and randomisation methods in a trial of general practitioner-led interventions to increase physical activity: a randomised controlled feasibility study with factorial design

 

Randomisation method

 

Practice (cluster)

Individual

Days from date of recruitment of first participant to recruitment of final participant by randomisation method (mean (sd), n)

58.1 (55.3), 18

58.0 (78.2), 5

Between-group mean difference (95% CI)

0.1 (-63.3; 63.5)

 

Recruitment method

 

Opportunistic

Systematic

Days from date of recruitment of first participant to recruitment of final participant by recruitment method (mean (sd), n)

31.8 (34.2), 12

86.7 (68.0), 11

Between-group mean difference (95% CI)a

-54.9 (-103.6; -6.2)

  1. a95% CI derived from t-test with unequal variances. CI, confidence interval; sd, standard deviation.