Table 3.
Physical Activity and Puberty Details for the Children in This Study
| Children without fractures (n = 2499) [N (%)] |
Children with fractures (n = 193) [N (%)] |
p value for difference between children with and without fractures |
Crude OR for fracture risk OR (95% CI) |
Adjusted OR for fracture risk OR (95% CI), p value* |
Adjusted OR for fracture risk† |
Adjusted OR for fracture risk‡ |
|
|---|---|---|---|---|---|---|---|
| Time outdoors in summer | |||||||
| <28 h/wk | 696 (95.7) | 31 (4.3) | <0.001 | 1.0 | 1.0 | 1.0 | 1.0 |
| ≥28 h/wk | 1803 (91.8) | 162 (8.2) | 2.01 (1.36, 2.99) | 2.39 (1.57, 3.63) | 2.37 (1.56, 3.62) | 2.38 (1.56, 3.62) | |
| Time outdoors in winter (tertiles) | |||||||
| 1 (least) | 1034 (91.7) | 94 (8.3) | 0.029 | 1.0 | 1.0 | 1.0 | 1.0 |
| 2 | 1166 (94.3) | 71 (5.7) | 0.67 (0.49, 0.92) | 0.53 (0.38, 0.75) | 0.54 (0.39, 0.76) | 0.53 (0.38, 0.75) | |
| 3(most) | 299 (91.4) | 28 (8.6) | 1.03 (0.66, 1.60) OR Test for Trend: 0.90 (0.72, 1.12) |
0.79 (0.50, 1.25) OR Test for Trend: 0.77 (0.61, 0.97) |
0.79 (0.50, 1.25) OR Test for Trend: 0.77 (0.61, 0.98) |
0.79 (0.50, 1.25) OR Test for Trend: 0.77 (0.61, 0.97) |
|
| Time watching TV (tertiles) | |||||||
| 1 (least) | 829 (92.0) | 72 (8.0) | 0.402 | 1.0 | 1.0 | 1.0 | 1.0 |
| 2 | 978 (93.6) | 67 (6.4) | 0.79 (0.56, 1.11) | 0.76 (0.53, 1.09) | 0.76 (0.53, 1.09) | 0.75 (0.52, 1.07) | |
| 3(most) | 692 (92.8) | 54 (7.2) | 0.90 (0.62, 1.30) OR test for trend: 0.94 (0.78, 1.13) |
0.77 (0.52, 1.14) OR test for trend: 0.86(0.71, 1.05) |
0.76 (0.51, 1.13) OR test for trend: 0.86 (0.70, 1.05) |
0.75 (0.51, 1.12) OR test for trend: 0.86 (0.70, 1.05) |
|
| Vigorous physical activity | |||||||
| <4 episodes | 1414 (94.5) | 82 (5.5) | <0.001 | 1.0 | 1.0 | 1.0 | 1.0 |
| 4–6 episodes | 742 (91.4) | 70 (8.6) | 1.63 (1.17, 2.27) | 1.68 (1.19, 2.37) | 1.70 (1.21, 2.40) | 1.71 (1.21, 2.41) | |
| daily or more | 343 (89.3) | 41 (10.7) |
2.06 (1.39, 3.05) OR test for trend: 1.46(1.21, 1.76) |
2.07 (1.37, 3.14) OR test for trend: 1.45 (1.19, 1.77) |
2.13 (1.40, 3.23) OR test for trend: 1.47 (1.20, 1.79) |
2.19 (1.44, 3.33) OR test for trend: 1.48 (1.22, 1.81) |
|
| Puberty (pubic hair distribution) | |||||||
| Tanner stage 1 | 2037 (92.6) | 164 (7.4) | 0.480 | 1.0 | 1.0 | 1.0 | 1.0 |
| Tanner stage 2 | 409 (94.0) | 26 (6.0) | 0.79 (0.52, 1.21) | 0.85 (0.54, 1.31) | 0.85 (0.54, 1.31) | 0.84 (0.54, 1.31) | |
| Tanner stage 3 | 53 (94.6) | 3 (5.4) | 0.70 (0.22, 2.27) OR test for trend: 0.81 (0.56, 1.15) |
0.70 (0.21, 2.35) OR test for trend: 0.83 (0.57, 1.20) |
0.72 (0.21, 2.43) OR test for trend: 0.83 (0.58, 1.20) |
0.74 (0.22, 2.49) OR test for trend: 0.84 (0.58, 1.21) |
Number and percentage for children with and without fractures are given, along with crude and adjusted ORs for fracture risk. Statistically significant relationships are shown in bold.