Table 1.
Comparisons of clinical characteristics categorized by daytime napping duration.
| Daytime napping duration |
|||
|---|---|---|---|
| Short (≤1 hr) |
Long (>1 hr) | P | |
| Number of subjects | 115 | 321 | |
| Age, years | 58.4 | 58.1 | 0.86 |
| Male gender, n (%) | 54 (47.0) | 147 (45.8) | 0.83 |
| Body mass index, kg/m2 | 22.9±0.5 | 24.4±0.3 | <0.01 |
| Current smoker, n (%) | 26 (22.6) | 86 (26.8) | 0.38 |
| Alcohol consumption, n (%) | 51 (44.4) | 106 (33.0) | 0.03 |
| Hypertension, n (%) | 70 (60.9) | 193 (60.1) | 0.89 |
| Dyslipidemia, n (%) | 60 (52.2) | 172 (53.6) | 0.80 |
| HbA1c, % | 5.7±0.0 | 5.7±0.0 | 0.46 |
| OGTT | |||
| NGT, n (%) | 36 (38.7) | 91 (36.3) | 0.68 |
| IGT, n (%) | 40 (43.0) | 114 (45.4) | 0.69 |
| DM Type, n (%) | 17 (18.3) | 46 (18.3) | 0.99 |
| Nap duration (min) | 34.1±9.9 | 189.0±5.9 | <0.01 |
| Nocturnal sleep duration (min) | 362.3±10.6 | 319.1±6.5 | <0.01 |
| Nocturnal activity index | 34.52±1.61 | 33.18±0.97 | 0.48 |
| Daytime activity mean | 155.58±4.47 | 119.43±2.68 | <0.01 |
| AHI | 8.6±1.0 | 9.4±0.6 | 0.46 |
Data are presented as the mean ± standard error (SE) for continuous variables, and number (%) for dichotomous variables. P values are shown for comparisons of mean values for the groups (unrepeated t-test) or percentages (chi-squared test). OGTT, oral glucose tolerance test; NGT, normal glucose tolerance; IGT, impaired glucose tolerance; DM, diabetes mellitus; AHI, apnea hypopnea index.