Table 3. Regression coefficients with confidence intervals showing association between activity, birth weight and size measurements and current body composition.
| Predictor | Mean (cpm) | Total counts/day×103 | V+M/RT (%) |
|---|---|---|---|
| Sex (1=male, 2=female) | −78.70 (−107.12, −50.29) | −65.18 (−87.99, −42.38) | −1.76 (−2.29, −1.24) |
| Age at activity assessment (years) | 4.44 (−8.83, 17.72) | 1.76 (−8.92, 124.44) | 1.47 (20.10, 0.40) |
| SLI (score) | −4.54 (−7.54, −1.55) | −3.34 (−5.74, −9.26) | −0.07 (−0.13, −0.01) |
| Birth measurementsa,b | |||
| Weight (kg) | 9.88 (−24.94, 44.69) | 0.39 (−27.63, 28.40) | <0.01 (−0.64, 0.64) |
| Length (cm) | −4.46 (−11.49, 2.56) | −2.93 (−8.58, 2.72) | −0.10 (−0.23, 0.03) |
| Abdominal circumference (cm) | 0.95 (−6.21, 8.11) | 0.52 (−5.23, 6.28) | <0.01 (−0.14, 0.13) |
| Chest circumference (cm) | −0.51 (−8.99, 7.96) | −0.13 (−6.95, 6.69) | −0.06 (−0.21, 0.10) |
| Head circumference (cm) | −1.23 (−10.45, 12.90) | −2.26 (−7.13, 11.65) | −0.08 (−0.29, 0.14) |
| Sum of skinfolds (mm)c | 0.25 (−8.02, 8.53) | −2.51 (−9.16, 4.14) | <0.01 (−0.16, 0.15) |
| AMA (cm2) | −1.57 (−14.16, 11.02) | −4.62 (−14.74, 5.49) | −0.10 (−0.34, 0.13) |
| Current measurementsa,d | |||
| Body fat (%) | −4.69 (−7.31, −2.07) | −3.31 (−5.43, −1.20) | −0.09 (−0.13, −0.04) |
| AMA (cm2) | 4.04 (−2.32, 10.40) | 3.91 (−1.20, 9.02) | 0.09 (−0.03, 0.20) |
RT, registered time; SLI, Standard of Living Index; AMA, arm muscle area.
V, time spent vigorously active; M, time spent moderately active; RT, RT during which actigraph was worn; cpm, accelerometer counts per minute. Figures in parentheses are confidence intervals. The results in bold were statistically significant at the P=0.05 level.
a
Gender and age at accelerometer wearing were included in the model.
b
Gestation-adjusted birthweight.
c
Sum of triceps and subscapular skinfolds.
d
Measurements made within 6 months of time of physical activity monitoring.