Table 1. Socio-demographic characteristics of women according to age at natural menopause.
| Characteristics | Age at natural menopause (years) | Ptrend | ||||
|---|---|---|---|---|---|---|
| ≤40 | 41–44 | 45–49 | 50–52 | ≥ 53 | ||
| Number of women N (%) | 581 (3.40) | 1152 (6.75) | 7559 (44.27) | 5432 (31.81) | 2352(13.77) | |
| Age (years) N (%) | <0.01 | |||||
| ≤50 | 95(16.35) | 165(14.32) | 906(11.99) | 101(1.86) | 0(0.00) | |
| 51–55 | 79(13.60) | 243(21.09) | 1925(25.46) | 1904(35.05) | 482(20.49) | |
| 56–60 | 118(20.31) | 276(23.96) | 1952(25.82) | 1601(29.47) | 1033(43.92) | |
| 61–65 | 97(16.69) | 209(18.14) | 1275(16.87) | 907(16.70) | 493(20.96) | |
| >65 | 192(33.05) | 259(22.48) | 1501(19.86) | 919(16.92) | 344(14.63) | |
| Marriage status N (%) | 0.01 | |||||
| Married | 471(81.07) | 1000(86.81) | 6502 (86.02) | 4713 (86.76) | 2038 (86.65) | |
| Unmarried | 110(18.93) | 152(13.19) | 1057(13.98) | 719(13.24) | 314(13.35) | |
| Highest education N (%) | 0.02 | |||||
| No formal school | 460(79.17) | 875(75.96) | 5663(74.92) | 3945(72.63) | 1621(68.92) | |
| Primary school | 100(17.21) | 224(19.44) | 1611(21.31) | 1283(23.62) | 602(25.59) | |
| Middle school | 16(2.76) | 41(3.56) | 234(3.10) | 169(3.11) | 102(4.34) | |
| High school or above | 5(0.86) | 12(1.04) | 51(0.67) | 35(0.64) | 27(1.15) | |
| Annual household income (Yuan) N (%) | 0.04 | |||||
| <20,000 | 177(30.47) | 326(28.30) | 2000(26.46) | 1369(25.20) | 610(25.94) | |
| 20,000–35,000 | 219(37.69) | 433(37.59) | 2978(39.40) | 2195(40.41) | 935(39.75) | |
| ≥ 35,000 | 185(31.84) | 393(34.11) | 2581(34.14) | 1868(34.39) | 807(34.31) | |
Differences between the two menopausal age groups (≤ 44 years and ≥45 years) were compared using linear-by-linear association chi-square test.