| Variable | Mean±SD | t or F-value | P-value |
|---|---|---|---|
| Sex | 1.456 | 0.147 | |
| Male | 22.67±2.65 | ||
| Female | 22.07+3.18 | ||
| Age range (yr) | 1.176 | 0.323 | |
| ≤29 | 22.23±3.01 | ||
| 30-39 | 22.30+3.02 | ||
| 40-49 | 22.24+3.09 | ||
| 50-59 | 22.79±2.35 | ||
| ≥60 | 23.72±1.45 | ||
| Married | 0.188 | 0.851 | |
| Yes | 22.42±2.99 | ||
| No | 22.50±2.70 | ||
| Living status | 0.085 | 0.919 | |
| With family member | 22.43±2.82 | ||
| Living alone | 22.68±3.26 | ||
| Others | 22.67±3.22 | ||
| Education level | 1.386 | 0.167 | |
| ≤High school | 22.96±2.33 | ||
| ≥Bachelor | 22.31±2.99 | ||
| Religion | -1.363 | 0.175 | |
| Yes | 22.77±2.72 | ||
| No | 22.23±2.94 | ||
| Occupation | -1.738 | 0.084 | |
| Yes | 22.22±2.96 | ||
| No | 22.96±2.58 | ||
| Monthly household income (Korean won) | -0.072 | 0.942 | |
| <3 million | 22.44±2.88 | ||
| ≥3 million | 22.47±2.85 | ||
| Smoking | -0.772 | 0.441 | |
| Yes | 22.07±3.19 | ||
| No | 22.52+2.81 |