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Table 1 Characteristics of the children and parents who participated in B-PROACT1V in Year 1, Year 4 and both years

From: Change in children’s physical activity and sedentary time between Year 1 and Year 4 of primary school in the B-PROACT1V cohort

Child Characteristic Participated in Year 1
(N = 1,299)
Participated in Year 4
(N = 1,223)
Participated in both Year 1 and Year 4
(N = 685)
Year 1 Year 4
N with data   N with data   N with data   N with data  
Gender N (%) Boy 1299 666 (51.3) 1223 556 (45.5) 685 323 (47.2) As for Year 1 As for Year 1
Girl 633 (48.7) 667 (54.5) 362 (52.8)  
BMI age-adjusted z-score Mean (SD) 1024 0.24 (0.93) 962 0.32 (1.07) 570 0.18 (0.91) 554 0.28 (1.04)
IMD score Median (IQR) 1171 10.8 (6.2, 19.4) 1204 11.1 (6.6, 21.7) 627 10.5 (6.1, 18.9) 673 10.4 (5.7, 20.8)
Moved schools between Year 1 and Year 4 (school information) N (%) No 1022 912 (89.2)    685 682 (99.6)   
Yes 110 (10.8) 3 (0.4)
Moved schools between Year 1 and Year 4 (parent questionnaire) N (%) No   1000 874 (87.4)   573 551 (96.2)
Yes 126 (12.6) 22 (3.8)
Number of siblings N (%) 0 791 36 (4.6) 996 173 (17.4) 432 19 (4.4) 570 91 (16.0)
1 471 (59.5) 498 (50.0) 275 (63.7) 307 (53.9)
2 215 (27.2) 232 (23.3) 110 (25.5) 129 (22.6)
3 or more 69 (8.7) 93 (9.3) 28 (6.5) 43 (7.5)
Female parent responded N (%) No 1299 414 (31.9) 1223 420 (34.3) 685 217 (31.7) 685 212 (30.9)
Yes 885 (68.1) 803 (65.7) 468 (68.3) 473 (69.1)
Male parent responded N (%) No 1299 775 (59.7) 1223 733 (59.9) 685 400 (58.4) 685 401 (58.5)
Yes 524 (40.3) 490 (40.1) 285 (41.6) 284 (41.5)
Female parent age (years) Mean (SD) 839 37.3 (5.5) 740 40.8 (6.0) 457 37.6 (5.6) 439 40.7 (5.7)
Male parent age (years) Mean (SD) 498 39.8 (5.8) 382 43.2 (6.1) 274 40.1 (6.0) 218 43.6 (5.8)
Female parent BMI (kg/m2) Mean (SD) 844 25.0 (4.5) 761 25.8 (5.2) 450 24.8 (4.3) 451 25.4 (4.8)
Male parent BMI (kg/m2) Mean (SD) 511 26.3 (3.9) 475 26.4 (3.9) 280 26.1 (3.8) 278 26.4 (3.8)
Female parent ethnicity N (%) White British 885 788 (89.0) 802 707 (88.2) 592 527 (89.0) As for Year 1 As for Year 1
White Other 44 (5.0) 47 (5.9) 31 (5.2)  
Black/Black British 14 (1.6) 8 (1.0) 7 (1.2)  
Asian/Asian British 20 (2.3) 23 (2.9) 18 (3.0)  
Mixed 10 (1.1) 9 (1.1) 6 (1.0)  
Other 9 (1.0) 8 (1.0) 3 (0.5)  
Male parent ethnicity N (%) White British 521 465 (89.3) 490 436 (89.0) 419 380 (90.7) As for Year 1 As for Year 1
White Other 22 (4.2) 21 (4.3) 15 (3.6)
Black/Black British 3 (0.6) 5 (1.0) 3 (0.7)
Asian/Asian British 16 (3.1) 16 (3.3) 12 (2.9)
Mixed 6 (1.2) 8 (1.6) 5 (1.2)
Other 9 (1.7) 4 (0.8) 4 (1.0)
Female parent employment status N (%) Working full time 882 133 (15.1) 803 198 (24.7) 466 81 (17.4) 473 109 (23.0)
Working part-time 488 (55.3) 438 (54.5) 256 (54.9) 274 (57.9)
Full time parent/care-giver 193 (21.9) 121 (15.1) 95 (20.4) 65 (13.7)
In full time education 13 (1.5) 8 (1.0) 3 (0.6) 5 (1.1)
Not currently employed 55 (6.2) 38 (4.7) 31 (6.7) 20 (4.2)
Male parent employment status N (%) Working full time 517 462 (89.4) 490 454 (92.7) 281 256 (91.1) 284 264 (93.0)
Working part-time 28 (5.4) 23 (4.7) 11 (3.9) 10 (3.5)
Full time parent/care-giver 10 (1.9) 3 (0.6) 5 (1.8) 2 (0.7)
In full time education 3 (0.6) 1 (0.2) 2 (0.7) 1 (0.4)
Not currently employed 14 (2.7) 9 (1.8) 7 (2.5) 7 (2.5)