Wave 2 (2006) | Wave 3 (2008) | Wave 4 (2010) | Wave 5 (2012) | Wave 6 (2014) | |
Participants, n | 4464 | 4332 | 4169 | 3956 | 3537 |
Age, mean (SD) | 6.3 (0.5) | 8.3 (0.4) | 10.3 (0.8) | 12.4 (0.5) | 14.4 (0.5) |
Male gender, n (%) | 2276 (51) | 2212 (51) | 2132 (51) | 2020 (51) | 1798 (51) |
BMI, kg/m2 mean (SD) | 16.5 (2.1) | 17.6 (2.8) | 19.0 (3.8) | 20.5 (3.9) | 21.9 (4.1) |
Older sibling(s) present in the home, n (%) | 2563 (57) | 2464 (57) | 2297 (55) | 2076 (52) | 1722 (49) |
Incident asthma, n (%) | 295 (8.39) | 129 (4.26) | 96 (3.53) | 51 (2.02) | 40 (1.79) |
Current asthma, n (%) | 995 (22.3) | 872 (20.1) | 814 (19.5) | 734 (18.6) | 581 (16.4) |
Wheeze, n (%) | 697 (15.6) | 527 (12.2) | 468 (11.2) | 380 (9.6) | 295 (8.3) |
Asthma medication use, n (%) | 685 (15.3) | 667 (15.4) | 637 (15.3) | 592 (15.0) | 469 (13.3) |
Both wheeze and medication use, n (%) | 387 (8.7) | 322 (7.4) | 291 (7.0) | 238 (6.0) | 183 (5.2) |
Wheeze without medication, n (%) | 310 (6.9) | 205 (4.7) | 177 (4.3) | 142 (3.6) | 112 (3.2) |
TUD completed, n (%) | 3385 (53) | 2911 (67) | 3483 (84) | 2896 (73) | 2157 (61) |
Day of the week | |||||
Monday, n (%) | 306 (9.0) | 242 (8.3) | 563 (16.2) | 518 (17.9) | 354 (16.4) |
Tuesday, n (%) | 320 (9.5) | 307 (10.6) | 635 (18.2) | 504 (17.4) | 384 (17.8) |
Wednesday, n (%) | 351 (10.4) | 290 (10.0) | 587 (17.1) | 470 (16.2) | 367 (17.0) |
Thursday, n (%) | 379 (11.2) | 319 (11.0) | 524 (15.0) | 430 (14.8) | 293 (13.6) |
Friday, n (%) | 364 (10.8) | 294 (10.1) | 495 (14.2) | 393 (13.6) | 312 (14.5) |
Saturday, n (%) | 798 (23.6) | 726 (24.9) | 147 (4.2) | 138 (4.8) | 102 (4.7) |
Sunday, n (%) | 855 (25.3) | 732 (25.1) | 522 (15.0) | 443 (15.3) | 345 (16.0) |
Hours spent in MVPA per day*, mean (SD) | |||||
All participants | 3.3 (2.6) | 3.4 (2.7) | 2.3 (1.6) | 1.9 (1.6) | 1.8 (1.6) |
Participants with current asthma | 3.2 (2.6) | 3.3 (2.7) | 2.2 (1.6) | 1.9 (1.5) | 1.8 (1.5) |
Participants without current asthma | 3.4 (2.6) | 3.4 (2.7) | 2.3 (1.6) | 1.9 (1.6) | 1.8 (1.6) |
*This does not distinguish between weekday and weekend day, since one diary was randomly selected for children who completed two TUDs at earlier waves.
BMI, body mass index; MVPA, moderate-to-vigorous physical activity; TUD, time use diary.