Table 2 Baseline characteristics of participants by study group and SIMD
|  | Total | SIMD 4–5 | SIMD 1–3 | SIMD 1–3 vs SIMD 4–5 |
|---|---|---|---|---|
Age (years) | 8.4 ± 2.0 (379) | 8.4 ± 1.9 (264) | 8.4 ± 2.0 (115) | t = 0.033 |
 Intervention school | 8.1 ± 2.0 (252) | 8.1 ± 2.0 (182) | 8.2 ± 2.1 (70) | SMD = 0.004 |
 Control school | 8.8 ± 1.8 (127) | 8.9 ± 1.8 (82) | 8.6 ± 1.8 (45) | p = 0.974 |
Daily MVPA (min) | 55 ± 22 (118) | 56 ± 21 (92) | 51 ± 25 (26) | t = 1.024 |
 Intervention school | 53 ± 22 (56) | 52 ± 19 (42) | 57 ± 29 (14) | SMD = 0.227 |
 Control school | 56 ± 22 (62) | 60 ± 22 (50) | 44 ± 17 (12) | p = 0.308 |
Daily sedentary time (min) | 345 ± 74 (118) | 342 ± 70 (92) | 356 ± 86 (26) | t = 0.879 |
 Intervention school | 337 ± 77 (56) | 337 ± 70 (42) | 337 ± 97 (14) | SMD = 0.195 |
 Control school | 352 ± 71 (62) | 346 ± 70 (50) | 378 ± 70 (12) | p = 0.381 |
Total shuttle distance (m) | 670 ± 351 (357) | 702 ± 368 (252) | 593 ± 294 (105) | t = 2.695 |
 Intervention school | 645 ± 351 (240) | 658 ± 365 (173) | 613 ± 314 (67) | SMD = 0.313 |
 Control school | 722 ± 347 (117) | 800 ± 359 (79) | 559 ± 255 (38) | p = 0.007 |
Sum of skinfolds (mm) | 35.1 ± 14.7 (327) | 32.9 ± 13.0 (229) | 40.4 ± 16.9 (98) | t = 4.350 |
 Intervention school | 33.8 ± 12.7 (213) | 32.4 ± 11.9 (154) | 37.5 ± 14.0 (59) | SMD = 0.525 |
 Control school | 37.6 ± 17.6 (114) | 33.8 ± 15.0 (75) | 44.8 ± 20.0 (39) | p < 0.001 |
% meeting physical activity guidelines | 36.4% (118) | 39.1% (92) | 26.9% (26) | χ2 = 1.304, p = 0.253 OR = 0.573 (0.219–1.500), p = 0.260 |
 Intervention school | 26.8% (56) | 26.2% (42) | 28.6% (14) | |
 Control school | 45.2% (62) | 50.0% (50) | 25.0% (12) | |
% overweight or obese | 16.8% (369) | 12.4% (259) | 27.3% (110) | χ2 = 12.291, p < 0.001 OR = 2.660 (1.520–4.655), p < 0.001 |
 Intervention school | 16.7% (246) | 12.4% (178) | 27.9% (68) | |
 Control school | 17.1% (123) | 12.3% (81) | 26.2% (42) |