Table 1.
Characteristics of the Infants in Whom Physical Activity Was Measured by Accelerometry (N = 143)
| N | Percent or mean (SD) | |
|---|---|---|
| Demographic characteristics | ||
| Age (weeks) | 143 | 29.5 (4.3) |
| Sex | ||
| Males | 75 | 52.5 |
| Females | 68 | 47.5 |
| Race | ||
| Non-Hispanic White | 63 | 44.1 |
| Non-Hispanic Black | 48 | 33.6 |
| Hispanic | 26 | 18.2 |
| Other | 6 | 4.1 |
| Parent education | ||
| College or above | 79 | 58.1 |
| Less than college | 57 | 41.9 |
| Physical characteristics | ||
| Weight status | ||
| BMI z-score (wt/ht2) | 143 | 0.43 (1.17) |
| Weight for length z-score (wt/ht) | 143 | 0.55 (1.14) |
| Motor development | ||
| Stationary raw score | 139 | 27.5 (5.8) |
| Locomotion raw score | 135 | 25.8 (9.6) |
| Care & social environment characteristics | ||
| Care setting | ||
| Home | 67 | 48.6 |
| Relative's home | 17 | 12.3 |
| Structured care | 54 | 39.1 |
| Older siblings | ||
| Yes | 96 | 71.1 |
| No | 39 | 28.9 |
| Home PA & environment factors | ||
| Resources used by infant in home (e.g., toys, play-space) | 137 | 2.6 (1.6) |
| Weekday outdoor playtime (min/day) | 128 | 41.9 (72.8) |
| Weekend outdoor playtime (min/day) | 131 | 73.3 (87.5) |
| Tummy time (times/week) | 126 | 33.4 (29.0) |
| Age infant first rolled over (months) | 132 | 4.1 (1.2) |
| Playpen time (min/day) | 138 | 47.4 (101.0) |
| Bouncer time (min/day) | 133 | 74.8 (83.5) |
| Car seat time (min/day) | 132 | 56.8 (60.7) |
| Stroller time (min/day) | 127 | 30.0 (42.8) |
| Restrictive devices index (i.e., time in bouncer, car seat, stroller) (min/day) | 137 | 155.1 (124.7) |
PA, physical activity.