Table 1. Subjects' characteristics stratified according to sex.
| Characteristics | Male | Female | P |
| Age(years),Mean ± SD | 69.0±6.5 | 68.7±6.7 | >0.05 |
| Age, n (%) | |||
| 60∼ | 453(56.6) | 708(59.0) | >0.05 |
| 70∼ | 287(35.8) | 406(33.9) | |
| ≥80 | 61(7.6) | 85(7.1) | |
| Number of children, Mean ± SD | 3.3±1.5 | 3.5±1.4 | <0.01 |
| Number of children (%) | |||
| 0 | 20(2.5) | 11(0.9) | <0.05 |
| 1∼4 | 621(77.5) | 937(78.1) | |
| ≥5 | 160(20.0) | 251(21.0) | |
| Marital status, n (%) | |||
| married | 570(71.2) | 698(58.2) | <0.01 |
| widowed/divorced/single/separated | 231(28.8) | 501(41.8) | |
| Education, n (%) | |||
| ≤5 years | 495(61.8) | 1125(93.8) | <0.01 |
| ≥6 years | 306(38.2) | 74(6.2) | |
| Living arrangement, n (%) | |||
| living alone | 126(15.7) | 213(17.8) | <0.05 |
| living with spouse | 345(43.1) | 399(33.3) | |
| living with spouse and children | 294(36.7) | 528(44.0) | |
| living with other family members | 36(4.5) | 59(4.9) | |
| Living source, n (%) | |||
| depending solely on self-made income | 381(47.6) | 440(36.7) | <0.01 |
| depending partially on self-made income | 329(41.1) | 512(42.7) | |
| depending solely on children | 91(11.4) | 247(20.6) | |
| Chronic disease, n (%) | |||
| yes | 481(60.1) | 735(61.3) | >0.05 |
| no | 320(39.9) | 464(38.7) | |
| Physical disability, n (%) | |||
| yes | 73(9.11) | 93(7.8) | >0.05 |
| no | 728(90.89) | 1106(90.2) |
SD: Standard Deviation.