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Table 3 Practice recruitment timeframe

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

 

All sites combined

Small versus Medium

Small versus Large

Medium versus Large

Days from date of initial invitation to date of EOI Practice list sizea Median (IQR), n; mean (sd) :

    

Small

56 (15, 59), 7; 40.7 (22.1)

   

Medium

24.5 (14.25, 42), 8; 26.9 (17.2)

   

Large

26 (20.5, 37.5), 9; 29.6 (13.6)

   

Between-group mean difference (95% CI)

 

13.8 (-8.1; 35.8)

11.2 (-8.0; 30.4)

-2.7 (-18.6; 13.3)

  

least deprived quartile versus central two quartiles

least deprived quartile versus most deprived

central two quartiles versus most deprived quartile

Days from date of initial invitation to date of EOI

    

Median (IQR), n; mean (sd):

    

Least deprived quartile

26 (22, 27), 3; 25.0 (2.6)

   

Central two quartiles

24 (18, 57), 15; 33.6 (20.0)

   

Most deprived quartile

26.5 (15, 49.5), 6; 31.2 (17.2)

   

Between-group mean difference (95% CI)

 

-8.6 (-20.0; 2.8)b

-6.2 (-24.2; 11.9)b

2.4 (-17.1; 22.0)

  1. aSmall: <3,500; Medium: 3,500 to 8,000; Large >8,000.b95% CI derived from t-test with unequal variances. CI, confidence interval; EOI: Expression of interest; IQR, interquartile range; sd, standard deviation.