Table 4. Temporal associations of sleep health parameters on the previous night with physical activity, sedentary behavior and screen time the next day.
| During school hours | After school hours | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| MVPA(during) | SED(during) | MVPA(after) | SED(after) | SCT a | ||||||
| b (95% CI) | P | b (95% CI) | P | b (95% CI) | P | b (95% CI) | P | b (95% CI) | P | |
| Total sleep time b | 0.36 (-0.20, 0.92) |
.211 | -10.66 (-13.33, -7.98) |
< .001 | 0.16 (-0.70, 1.02) |
.711 | -5.88 (-9.44, -2.33) |
.001 | 0.0002 (-0.002, 0.002) |
.806 |
| Sleep efficiency | -0.04 (-0.24, 0.16) |
.693 | 1.33 (0.39, 2.28) |
.006 | -0.06 (-0.36, 0.25) |
.713 | 0.78 (-0.49, 2.05) |
.225 | 0.005 (-0.02, 0.03) |
.706 |
| Sleep fragment | 2.43 (-1.75, 6.61) |
.254 | -3.18 (-22.48, 16.12) |
.746 | 3.82 (-2.73, 10.36) |
.252 | -25.63 (-52.89, 1.63) |
.065 | -0.004 (-0.02, 0.01) |
.639 |
| Sleep quality a | 6.45 (0.70, 12.21) |
.028 | -23.62 (-51.99, 4.74) |
.102 | 8.43 (-0.24, 17.09) |
.057 | -39.85 (-75.6, -4.10) |
.029 | -0.49 (-1.29, 0.32) |
.237 |
MVPA = moderate- and vigorous-intensity physical activity; SED = sedentary behavior; SCT = screen time; b = unstandardized regression coefficient; P = P-value
Note. the estimates are obtained from a linear mixed model adjusting for study covariates including gender, grade, race, and body mass index group.
a log-transformed.
b the estimates are multiplied by 30 to indicate the changes in sleep health parameters by 30-min increments in total sleep time with an exception for the model predicting SCT that was log-transformed.