Table 1.
Descriptive statistics, twin correlations, and variance components for body mass index, moderate to vigorous physical activity, neighborhood walking, and environmental walkability.
| Walkability | Moderate-to- Vigorous Physical Activity (min/week) |
Walking (min/week) |
Body Mass Index (kg/m2) |
|
|---|---|---|---|---|
| Descriptive | ||||
| Statistics | ||||
| M | 40.591 | 119.592 | 87.806 | 25.751 |
| SD | 28.073 | 91.820 | 100.571 | 5.540 |
| Median | 38 | 100 | 60 | 24.442 |
| Range | 0–100 | 0–350 | 0–630 | 13.7–64.2 |
| 1st Quartile | 15 | 50 | 15 | 21.853 |
| 3rd Quartile | 63 | 180 | 120 | 28.319 |
| Sibling | ||||
| Correlations | ||||
| MZ | .401 (.018) | .327 (.015) | .287 (.015) | .752 (.006) |
| DZ | .316 (.028) | .164 (.023) | .132 (.024) | .370 (.018) |
| ACE Estimates | ||||
| h2 | .187 (.066) | .310 (.054) | .281 (.017) | .752 (.006) |
| c2 | .214 (.059) | .015 (.048) | .000 (.008) | .000 (.000) |
| e2 | .599 (.018) | .675 (.015) | .719 (.015) | .248 (.006) |
| Phenotypic | ||||
| Correlations | ||||
| Walkability | 1 | |||
| MVPA | .027 (.012) | 1 | ||
| Walking | .081 (.012) | .355 (.009) | 1 | |
| BMI | −.029 (.013) | −.156 (.010) | −.115 (.010) | 1 |
Note: Standard errors in parentheses.