Table 3.
Pearson Correlations between Physical Activity Measured by Accelerometry and Factors Hypothesized to be Associated with Physical Activity
| PA |
||
|---|---|---|
| Ankle site | Waist site | |
| Infant characteristics | ||
| Age (weeks) | 0.14 | 0.43*** |
| Weight status | ||
| Weight for length z-score (wt/ht) | 0.01 | 0.14† |
| BMI z-score (wt/ht2) | 0.01 | 0.17‡ |
| Motor development | ||
| Stationary raw score | 0.19* | 0.53*** |
| Locomotion raw score | 0.33*** | 0.57*** |
| Home PA & environment factors | ||
| Resources used by infant in home (e.g., toys, play space) | 0.24* | 0.33** |
| Weekday outdoor playtime (min/day) | 0.03 | 0.07 |
| Weekend outdoor playtime (min/day) | 0.12 | 0.13 |
| Tummy time (times/week) | 0.31** | 0.27** |
| Age infant first rolled over (months) | −0.24* | −0.29** |
| Playpen time (min/day) | −0.11 | −0.13 |
| Bouncer time (min/day) | −0.03 | −0.13† |
| Car seat time (min/day) | −0.13† | −0.19‡ |
| Stroller time (min/day) | −0.25* | −0.19‡ |
| Restrictive devices index (i.e., time in bouncer, car seat, stroller) (min/day) | −0.14† | −0.23* |
†
p < 0.20, ‡p < 0.10, *p < 0.05, **p < 0.01, ***p < 0.001.