Table 1. Comparison of baseline characteristics in habitual snorers and non-snorers.
| Variables | Habitual snorers (n = 511) | Non-snorers (n = 2 568) | P | |
|---|---|---|---|---|
| Pregnancy onset snorers (n = 361) | Chronic snorers (n = 150) | |||
| Maternal age, y | 26.50±3.54 | 27.11±4.56 | 25.98±3.53 | <0.001 |
| Pre-pregnancy BMI,kg/m2 | <0.001 | |||
| <18.5 | 44 (12.2) | 14 (9.3) | 524 (20.4) | |
| 18.5–23.9 | 250 (69.3) | 87 (58.0) | 1799 (70.1) | |
| 24.0–27.9 | 54 (15.0) | 31 (20.7) | 201 (7.8) | |
| ≥28.0 | 13 (3.6) | 18 (12.0) | 44 (1.7) | |
| Gestational age at Enrollment, weeks | 9.90±2.21 | 9.80±1.94 | 9.99±2.11 | 0.439 |
| Ethnic,% | 0.339 | |||
| Han | 358(99.2) | 149(99.3) | 2524(98.3) | |
| Other | 3(0.80) | 1(0.70) | 44(1.70) | |
| Area of residence,% | 0.266 | |||
| Urban | 294(81.4) | 121(80.7) | 2003(78.0) | |
| Rural | 67(18.6) | 29(19.3) | 565(22.0) | |
| Educational level(years),% | 0.041 | |||
| ≤9 | 77(21.3) | 41(27.3) | 493(19.2) | |
| 10–15 | 178(49.3) | 78(52.0) | 1400(54.5) | |
| >15 | 106(29.4) | 31(20.7) | 675(26.3) | |
| Family per capita monthly income, (RMB) | 0.220 | |||
| <2500 | 100(27.7) | 42(28.0) | 659(25.7) | |
| 2500–4000 | 147(40.7) | 74(49.3) | 1122(43.7) | |
| >4000 | 114(31.6) | 34(22.7) | 787(30.6) | |
| Gravidity,% | 0.026 | |||
| 1 | 195(54.0) | 68(45.3) | 1444(56.2) | |
| 2 | 100(27.7) | 48(32.0) | 741(28.9) | |
| ≥3 | 66(18.3) | 34(22.7) | 383(14.9) | |
| Smoking | <0.001 | |||
| Yes | 16(4.4) | 11(7.3) | 57(2.2) | |
| No | 345(95.6) | 139(92.7) | 2511(97.8) | |
| Only child or not | <0.001 | |||
| Yes | 151(41.8) | 63(42.0) | 821(32.0) | |
| No | 210(58.2) | 87(58.0) | 1747(68.0) | |
Continuous variables were shown as mean ± SD, categorical variables were shown as percentage.