Wave | ALSPAC | EYHS Denmark | EYHS Portugal | HEAPS | IBDS | PEACH | SPEEDY | CLANa | |
---|---|---|---|---|---|---|---|---|---|
Country | UK | Denmark | Portugal | Australia | US | UK | UK | Australia | |
Number of waves | 2 waves | 2 waves | 2 waves | 2 waves | 4 waves | 2 waves | 3 waves | 3 waves | |
Average follow-up duration (years) | W1-W2 | 2.1 ± 0.3 | 6.0 ± 0.3 | 7.2 ± 0.2 | 3.1 ± 0.2 | 2.9 ± 0.5 | 1.1 ± 0.1 | 1.0 ± 0.04 | 3.0 ± 0.06 |
W1-W3 | 5.4 ± 0.5 | 4.1 ± 0.1 | 4.9 ± 0.2 | ||||||
W1-W4 | 7.4 ± 0.5 | ||||||||
Data-collection period | W1 | All months 2003–2005 | All months 1997–1998 | January – June 2000 | February – December 2002–2003 | September –November 1998–2000 | January – November 2006–2008 | February – July 2007 | March–December 2001 |
W2 | All months 2005–2007 | All months 2003–2004 | January – July 2007–2008 | May – December | September –November 2000–2004 | All, 2007–2009 | March – July 2008 | July – November 2004 | |
W3 | September –November 2003–2005 | April–September 2011 | May–November 2006 | ||||||
W4 | September–December 2005–2007 | ||||||||
Number of participants with baseline accelerometer data / valid baseline accelerometer data | W1 | 6085 / 5455 | 529 / 283 | 1218 / 631 | 1389 / 1040 | 437 / 329 | 1269 / 816 | 2009 / 1708 | 1162 / 1022 |
Number of participants included in analysis | W1 | 2992 | 122 | 33 | 226 | 306 | 386 | 663 | 428 |
W2 | 2992 | 122 | 33 | 226 | 227 | 386 | 565 | 361 | |
W3 | 267 | 275 | 324 | ||||||
W4 | 213 | ||||||||
Gender (% boys) | W1 | 46.6 | 41.0 | 36.4 | 51.8 | 46.4 | 39.9 | 43.4 | 46.3 |
Mean age and range (years) | W1 | 11.7 ± 0.2 (10.6–13.6) | 9.6 ± 0.4 (8.6–10.5) | 9.7 ± 0.3 (9.1–10.4) | 8.1 ± 2.6 (5.0–12.6) | 5.6 ± 0.5 (4.7–7.5) | 10.9 ± 0.4 (10.1–11.8) | 10.2 ± 0.3 (9.5–10.8) | 9.5 ± 2.7 (5.5–15.0) |
W2 | 13.8 ± 0.2 (12.6–14.8) | 15.7 ± 0.4 (14.9–16.8) | 16.9 ± 0.31 (16.3–17.5) | 11.2 ± 2.6 (8.1–15.9) | 8.6 ± 0.5 (7.6–10.7) | 12.0 ± 0.4 (11.1–12.8) | 10.8 ± 0.4 (10.0–12.0)b | 12.5 ± 2.7 (8.5–15.9) | |
W3 | 11.1 ± 0.3 (10.6–12.7) | 14.3 ± 0.3 (13.7–14.9) | 14.1 ± 2.6 (10.5–17.7) | ||||||
W4 | 13.0 ± 0.3 (12.5–14.4) | ||||||||
BMI z-score | W1 | 0.31 ± 1.16 | 0.19 ± 0.98 | 0.44 ± 1.33 | 0.69 ± 0.98 | 0.37 ± 1.06 | 0.29 ± 1.17 | 0.37 ± 1.16 | 0.60 ± 1.04 |
W2 | 0.20 ± 1.09 | 0.08 ± 0.86 | 0.22 ± 0.99 | 0.62 ± 0.99 | 0.65 ± 1.31 | 0.30 ± 1.17 | NA. | 0.60 ± 1.07 | |
W3 | 0.73 ± 1.31 | 0.25 ± 1.20 | 0.54 ± 1.04 | ||||||
W4 | 0.65 ± 1.28 | ||||||||
Total sedentary time (minutes/day) | W1 | 370 ± 68 | 333 ± 101 | 366 ± 116 | 282 ± 73 | 246 ± 49 | 387 ± 64 | 371 ± 64 | 316 ± 79 |
W2 | 425 ± 76 | 492 ± 72 | 544 ± 78 | 388 ± 96 | 318 ± 57 | 414 ± 69 | 391 ± 65 | 381 ± 92 | |
W3 | 356 ± 65 | 475 ± 73 | 446 ± 104 | ||||||
W4 | 413 ± 73 | ||||||||
Prolonged sedentary time (minutes/day) | W1 | 158 ± 62 | 143 ± 103 | 183 ± 134 | 102 ± 45 | 81 ± 36 | 177 ± 61 | 172 ± 61 | 122 ± 57 |
W2 | 209 ± 78 | 272 ± 90 | 366 ± 97 | 176 ± 90 | 118 ± 49 | 196 ± 63 | 191 ± 64 | 172 ± 79 | |
W3 | 148 ± 56 | 269 ± 81 | 237 ± 110 | ||||||
W4 | 203 ± 73 | ||||||||
Day-to-day variation in total sedentary time (minutes/day) | W1 | 54 ± 19 | 53 ± 21 | 50 ± 24 | 48 ± 19 | 41 ± 19 | 55 ± 21 | 54 ± 21 | 51 ± 22 |
W2 | 60 ± 22 | 68 ± 27 | 74 ± 37 | 56 ± 21 | 47 ± 21 | 60 ± 22 | 55 ± 19 | 57 ± 22 | |
W3 | 51 ± 22 | 64 ± 25 | 63 ± 27 | ||||||
W4 | 57 ± 25 | ||||||||
Day-to-day variation in prolonged sedentary time (minutes/day) | W1 | 47 ± 19 | 45 ± 24 | 44 ± 23 | 40 ± 20 | 32 ± 17 | 48 ± 19 | 48 ± 20 | 43 ± 22 |
W2 | 55 ± 23 | 63 ± 28 | 84 ± 34 | 51 ± 23 | 38 ± 20 | 53 ± 21 | 53 ± 20 | 52 ± 24 | |
W3 | 43 ± 20 | 63 ± 23 | 61 ± 30 | ||||||
W4 | 57 ± 23 | ||||||||
MVPAc (minutes/day) (median with (interquartile range)) | W1 | 30 (24) | 23 (25) | 19 (33) | 38 (28) | 25 (18) | 21 (17) | 25 (21) | 35 (23) |
W2 | 30 (26) | 17 (20) | 23 (22) | 26 (23) | 31 (24) | 23 (20) | 23 (21) | 39 (30) | |
W3 | 26 (26) | 20 (21) | 29 (24) | ||||||
W4 | 22 (24) | ||||||||
Accelerometer wear time (minutes/day) | W1 | 792 ± 52 | 776 ± 56 | 783 ± 72 | 755 ± 64 | 768 ± 43 | 769 ± 60 | 773 ± 57 | 782 ± 65 |
W2 | 792 ± 62 | 831 ± 56 | 820 ± 78 | 778 ± 66 | 786 ± 44 | 786 ± 70 | 773 ± 61 | 796 ± 65 | |
W3 | 783 ± 43 | 796 ± 63 | 803 ± 66 | ||||||
W4 | 790 ± 57 |