Skip to main content

Table 1 Participant characteristics. Values are Mean(SD) unless otherwise stated

From: Revising on the run or studying on the sofa: prospective associations between physical activity, sedentary behaviour, and exam results in British adolescents

  All Boys Girls p value for difference
(n = 845) (n = 368) (n = 477)
Demographic variables
 Age 14·5 (0·5) 14·5 (0·5) 14·6 (0·5) 0·04
 BMI z-score 0·20 (1·06) 0·19 (1·08) 0·20 (1·04) 0·83
 Deprivation rank 24,455 (1199, 32319) 24,4890 (6098, 32319) 24,455 (1199, 32319) 0·20a
 MFQ 13 (8–20) 11 (7–17) 15 (8–23) <0·001a
Objective sedentary (mean hr/day)
 Sedentary 6·1 (2·1) 5·6 (2·0) 6·5 (2·1) <0·001
Objective physical activity (median (IQR) min/day)
 MVPA 38·8 (19·7-65·1) 56·4 (31·2- 82·9) 28·0 (14·0- 48·6) <0·001a
Self-reported sedentary (median (IQR) hr/day)
Combined variables
 Screen time 4·0 (2·8-5·5) 4·3 (3·1-5·7) 3·7 (2·6-5·1) <0·001a
 Non screen sedentary 1·5 (1·0-2·3) 1·3 (0·7-2·0) 1·6 (1·1-2·6) <0·001a
Individual variables
 TV viewing 1·9 (1·2-2·7) 1·9 (1·3-2·9) 1·9 (1·1-2·7) 0·436a
 Internet Use 1·3 (0·6-2·3) 1·1 (0·5-2·0) 1·6 (0·9-2·4) <0·001a
 Computer Games 0·1 (0·0-0·9) 0·9 (0·3-1·6) 0·0 (0·0-0·1) <0·001a
 Homework 1·0 (0·6-1·6) 1·0 (0·6-1·3) 1·2 (0·8-1·8) <0·001a
 Reading 0·3 (0·0-0·8) 0·2 (0·0-0·6) 0·5 (0·0-0·8) <0·001a
Academic achievement
 Total points1 416·6 (117·5) 394·1 (115·1) 434·0 (116·6) <0·001
  1. aWilcoxon-Mann–Whitney test
  2. 1Calculated to include GCSE and GNVQ results e.g., for GCSEs A* = 58, A = 52…G = 16, and similar for GNVQ grades