TABLE 2.
Means and variances of weekly MET hours (NTR) and items on frequency of exercise behavior (FinnTwin), split by sex and parental education, and p-values that result from equating means or variances to be equal for children of low and high educated parents
| A. Males | |||||
|---|---|---|---|---|---|
| Survey | Mean age (SD) | Low parental education | High parental education | p-value meana | p-value variancea |
|
Netherlands Twin Register
| |||||
| 7 | 7.53 (.34) | 14.31 (151.00), 1772 | 15.27 (127.40), 1727 | .04 | 2.6e-3 |
| 10 | 9.83 (.44) | 22.36 (388.51), 2092 | 22.88 (363.64), 1867 | .46 | .20 |
| 12 | 12.24 (.39) | 24.54 (437.36), 3872 | 27.33 (454.48), 2872 | 3.3e-6 | .33 |
| 14 | 14.63 (.59) | 29.05 (909.67), 1939 | 31.18 (734.93), 1648 | .04 | 2.1e-5 |
| 16 | 16.87 (.44) | 30.76 (1175.00), 1212 | 32.67 (944.54), 1114 | .19 | 4.2e-4 |
| 18 | 18.76 (.53) | 24.43 (800.51), 491 | 23.78 (731.59), 410 | .75 | .37 |
|
FinnTwin12 | |||||
| 12 | 11.42 (.30) | 3.39 (2.00), 1215 | 3.65 (1.55), 980 | 7.9e-5 | 1.3e-4 |
| 14 | 14.05 (.09) | 5.05 (2.42), 1088 | 5.13 (2.10), 896 | .25 | .04 |
| 17 | 17.62 (.22) | 4.79 (2.97), 970 | 5.02 (2.56), 804 | 9.7e-3 | .04 |
|
FinnTwin16 | |||||
| 16 | 16.17 (.13) | 4.69 (2.82), 1475 | 4.81 (2.76), 730 | .14 | .76 |
| 17 | 17.14 (.08) | 4.78 (2.82), 1372 | 4.99 (2.71), 693 | .02 | .57 |
| 18 | 18.61 (.17) | 4.69 (2.71), 1344 | 4.78 (2.52), 694 | .25 | .31 |
| B. Females | |||||
|---|---|---|---|---|---|
| Survey | Mean age (SD) | Low parental education | High parental education | p-value meana | p-value variancea |
|
Netherlands Twin Register
| |||||
| 7 | 7.51 (.34) | 9.47 (92.24), 1754 | 10.63 (85.97), 1725 | 1.9e-3 | .21 |
| 10 | 9.85 (.43) | 14.58 (244.58), 2163 | 16.61 (229.69), 1728 | 4.3e-4 | .24 |
| 12 | 12.24 (.39) | 16.53 (317.13), 4152 | 19.32 (303.72), 2921 | 1.9e-8 | .28 |
| 14 | 14.63 (.61) | 19.58 (625.80), 2584 | 23.32 (519.88), 1991 | 2.6e-6 | 5.2e-5 |
| 16 | 16.89 (.46) | 18.16 (567.56), 1851 | 22.34 (585.12), 1327 | 1.3e-5 | .58 |
| 18 | 18.76 (.49) | 14.68 (434.10), 976 | 17.77 (528.98), 649 | .01 n.s. | 8.7e-3 |
|
FinnTwin12 | |||||
| 12 | 11.41 (.30) | 2.85 (2.11), 1206 | 3.04 (2.08), 937 | 9.3e-3 | .80 |
| 14 | 14.04 (.08) | 4.90 (2.41), 1107 | 5.08 (1.97), 886 | .02 | 3.5e-3 |
| 17 | 17.61 (.23) | 4.80 (2.62), 1016 | 5.00 (2.19), 841 | 1.3e-2 | 1.2e-2 |
|
FinnTwin16 | |||||
| 16 | 16.15 (.13) | 4.67 (2.46), 1589 | 4.68 (2.13), 812 | .90 | .03 |
| 17 | 17.13 (.07) | 4.74 (2.27), 1539 | 4.84 (1.97), 797 | .16 | .04 |
| 18 | 18.59 (.16) | 4.72 (2.13), 1539 | 4.70 (2.20), 797 | .74 | .64 |
a
Compared to the model where means and variances are equal across twin order and zygosity status, but not across sex and parental education.