Table 2.
Segmented linear regression analysis of SPT, TST and blood pressure levels.
| Sleep duration | Model | Below the Cutoff Point | Above the Cutoff Point | ||
|---|---|---|---|---|---|
| SBP (mmHg) | DBP (mmHg) | SBP (mmHg) | DBP (mmHg) | ||
| SPT (1 h increase) | Model 1 | −3.48** | −1.35** | 2.27* | 0.56 |
| (−5.39, −1.56) | (−2.21, −0.50) | (0.15, 4.39) | (−0.77, 1.89) | ||
| Model 2 | −3.30** | −1.32** | 1.84 | 0.32 | |
| (−5.19, −1.41) | (−2.20, −0.43) | (−0.26, 3.93) | (−1.06, 1.71) | ||
| Model 3 | −2.94** | −1.21** | 1.51 | 0.17 | |
| (−4.82, −1.06) | (−2.05, −0.36) | (−0.61, 3.63) | (−1.19, 1.52) | ||
| TST (1 h increase) | Model 1 | −0.99 | −0.89** | 1.62 | 1.55* |
| (−2.22, 0.23) | (−1.55, −0.23) | (−0.91, 4.15) | (0.14, 2.96) | ||
| Model 2 | −0.78 | −0.74* | 1.56 | 1.47* | |
| (−2.23, 0.67) | (−1.39, −0.10) | (−0.96, 4.09) | (0.04, 2.90) | ||
| Model3 | −0.75 | −0.52 | 1.39 | 1.36 | |
| (−1.96, 0.45) | (−1.30, 0.25) | (−1.15, 3.94) | (−0.10, 2.82) | ||
SPT, sleep period time; TST, total sleep time; SBP, systolic blood pressure; DBP, diastolic blood pressure.
Cutoff Point: SPT = 7.6 h, TST = 7.1 h.
*p < 0.05; **p < 0.01.