Table 8 Predictive relationships between sleep and activity components at 1, 2 and 3.5 years of age and total body minus head BMC (g) at 5 yearsa
Age (years) | Mean BMC (SD) at 5 years of age (g) | Component | Regression coefficientb (SE) | p-value | 10% relative difference in minutes | Estimated difference (95% CI) in BMC with a 10% increase in component | Estimated difference (95% CI) in BMC with a 10% decrease in component |
|---|---|---|---|---|---|---|---|
1 (n = 229) | 380 (74) | Sleepc | 49.3 (27.5) | 0.075 | 71 | 8.4 (−0.8, 17.6) | − 8.4 (− 17.7, 0.8) |
|  |  | Sedentaryd | − 88.7 (27.7) | 0.002 | 56 | − 12.3 (− 19.8, − 4.8) | 12.8 (5.0, 20.6) |
|  |  | LPA | 42.6 (12.8) | 0.001 | 18 | 4.0 (1.7, 6.4) | −4.4 (− 7.0, − 1.8) |
|  |  | MVPA | −3.2 (3.8) | 0.400 | 0.1 | −0.3 (− 0.9, 0.4) | 0.3 (− 0.4, 1.0) |
2 (n = 158) | 383 (73) | Sleep | 19.6 (28.2) | 0.488 | 69 | 3.2 (−5.9, 12.4) | −3.3 (−12.5, 6.0) |
|  |  | Sedentary | −46.6 (26.2) | 0.077 | 46 | −5.8 (−12.2, 0.6) | 6.1 (−0.6, 12.9) |
|  |  | LPA | 3.1 (25.7) | 0.904 | 28 | 0.3 (−4.9, 5.6) | −0.4 (−6.0, 5.3) |
|  |  | MVPA | 23.9 (6.1) | < 0.001 | 0.6 | 2.0 (1.0, 3.0) | −2.2 (−3.3, −1.1) |
3.5 (n = 178) | 379 (74) | Sleep | −16.9 (50.4) | 0.738 | 65 | −2.7 (−18.3, 12.9) | 2.7 (−13.2, 18.6) |
|  |  | Sedentary | −26.0 (40.5) | 0.522 | 47 | −3.3 (−13.3, 6.7) | 3.5 (−7.1, 14.0) |
|  |  | LPA | 16.9 (29.4) | 0.565 | 29 | 1.8 (−4.3, 7.8) | −1.9 (−8.4, 4.6) |
|  |  | MVPA | 26.0 (11.1) | 0.021 | 2 | 2.2 (0.3, 4.0) | −2.4 (−4.4, −0.4) |
5 (n = 213) | 383 (73) | Sleep | −93.5 (47.7) | 0.051 | 64 | −14.4 (−28.8, 0.005) | 14.7 (−0.006, 29.4) |
|  |  | Sedentary | 75.1 (35.4) | 0.035 | 49 | 9.6 (0.7, 18.5) | −10.1 (−19.5, −0.8) |
|  |  | LPA | −19.6 (26.4) | 0.458 | 28 | −2.0 (−7.4, 3.3) | 2.2 (−3.6, 8.0) |
|  |  | MVPA | 38.0 (10.9) | 0.001 | 3 | 3.2 (1.4, 5.0) | −3.5 (−5.5, −1.6) |