Table 3.
Segmented linear regression analysis of SPT and TST with blood pressure levels by hypertension status.
| Hypertension status | N | Sleep duration | Below the Cutoff Point | Above the Cutoff Point | ||
|---|---|---|---|---|---|---|
| SBP (mmHg) | DBP (mmHg) | SBP (mmHg) | DBP (mmHg) | |||
| Hypertension | 308 | SPT | −3.16** (−4.85, −1.47) |
−1.26* (−2.31, −0.21) |
1.79 (−0.73, 4.31) |
0.53 (−1.35, 2.41) |
| TST | −1.14 (−2.69, 0.41) |
−0.85* (−1.79, −0.09) |
1.54 (−0.92, 4.00) |
1.43 (−0.13, 2.99) |
||
| Non-hypertension | 451 | SPT | −2.38* (−4.28–0.48) |
−1.08* (−2.09, −0.07) |
1.42 (−1.68, 4.52) |
0.36 (−1.58, 2.30) |
| TST | −0.66 (−2.37, 1.05) |
−0.43 (−1.65, 0.79) |
1.23 (−1.81, 4.27) |
1.29 (−0.41, 2.99) |
||
Adjusted for sex, age, residential area (urban/rural), education level, BMI, smoking status, alcohol consumption, diabetes history, AHI, and sleep midpoint.
Cutoff Point: SPT = 7.6 h, TST = 7.1 h.
SPT, sleep period time; TST, total sleep time; SBP, systolic blood pressure; DBP, diastolic blood pressure.
*p < 0.05; **p < 0.01.