Table 4.
Multivariate linear regression analysis of factors associated with Matsuda index in short- and long-time nocturnal sleep duration groups.
| Variables | β (SE) | adjusted R2 |
|---|---|---|
| Subjects with short sleep duration (≤6 hr) (n=255) | ||
| Model 1 | 0.23 | |
| Nap duration (≤1 hr=0, >1 hr=1) | -0.137 (0.07)* | |
| Model 2 | 0.24 | |
| SDNN | 0.117 (0.19) | |
| Model 3 | 0.25 | |
| Nap duration (≤1 hr=0, >1 hr=1) | -0.118 (0.07) | |
| SDNN | 0.094 (0.19) | |
| Subjects with long sleep duration (>6 hr) (n=181) | ||
| Model 1 | 0.27 | |
| Nap duration (≤1 hr=0, >1 hr=1) | -0.156 (0.06) | |
| Model 2 | 0.24 | |
| SDNN | 0.122 (0.23) | |
| Model 3 | 0.26 | |
| Nap duration (≤1 hr=0, >1 hr=1) | -0.157 (0.06) | |
| SDNN | 0.112 (0.23) | |
Standard beta coefficient and standard error (SE) values are shown. For multivariate linear regression analyses, the covariates included age, gender, body mass index, current smoker, alcohol consumption, hypertension, dyslipidemia, and HbA1c. Model 1 includes Nap duration, Model 2 SDNN, and Model 3 Nap duration and SDNN, in addition to other covariates already noted. SDNN, standard deviation of NN(RR) interval. *p<0.05.