Table 1.
The Sociodemographic and clinical information of the RPL group and the control group.
| Parameters | RPL Group (n = 247) | Control Group (n = 193) | p-Value | ||
|---|---|---|---|---|---|
| n | % | n | % | ||
| Gestational Status | |||||
| Non-pregnant | 72 | 29.2% | 31 | 16.1% | <0.01 |
| First Trimester | 106 | 42.9% | 67 | 34.7% | |
| Second or Third Trimester | 69 | 27.9% | 95 | 49.2% | |
| Age (years) | |||||
| ≤35 | 206 | 83.4% | 177 | 91.7% | <0.01 |
| ≥36 | 41 | 16.6% | 16 | 8.3% | |
| BMI (kg/m2) | |||||
| <18.5 | 23 | 9.3% | 17 | 8.8% | 0.96 |
| 18.5–24 | 170 | 68.8% | 132 | 68.4% | |
| >24 | 54 | 21.9% | 44 | 22.8% | |
| Working Hours (hours/day) | |||||
| ≤8 | 194 | 78.5% | 159 | 82.4% | 0.19 |
| >8 | 53 | 21.5% | 34 | 17.6% | |
| Education Background | |||||
| University and Higher | 149 | 60.3% | 147 | 76.2% | <0.01 |
| Lower Levels of Education | 98 | 39.7% | 46 | 23.8% | |
| Smoking | |||||
| Yes | 7 | 2.8% | 9 | 4.7% | 0.22 |
| No | 240 | 97.2% | 184 | 95.3% | |
| Alcohol Consumption | |||||
| Yes | 3 | 1.2% | 6 | 3.1% | 0.15 |
| No | 244 | 98.8% | 187 | 96.9% | |
| Residence | |||||
| Rural | 27 | 10.9% | 7 | 3.6% | <0.01 |
| Urban | 220 | 89.1% | 186 | 96.4% | |
| Times of Spontaneous Miscarriage | |||||
| 2 | 155 | 62.8% | — | — | — |
| >2 | 92 | 37.2% | — | — | |
| History of Stillbirth | |||||
| Yes | 35 | 14.2% | — | — | — |
| No | 212 | 85.8% | — | — | |
| History of Induced Abortion | |||||
| Yes | 166 | 67.2% | — | — | — |
| No | 81 | 32.8% | — | — | |
| History of Live Birth | |||||
| Yes | 28 | 11.3% | — | — | — |
| No | 219 | 88.7% | — | — | |
| Household Income (CNY/month) | |||||
| ≤10,000 | 92 | 37.2% | — | — | — |
| >10,000 | 155 | 62.8% | — | — | |
| Self-Reported Depression | 112 | 45.3% | 58 | 30.1% | <0.01 |
Clinical information regarding times of spontaneous pregnancy loss, history of pregnancy loss > 12 weeks, history of induced abortion, live birth, and household income were not investigated in the control group. BMI: body mass index. p-values were calculated by chi-squared test, and p < 0.05 was regarded as a statistical difference.