Table 1 Characteristics of pregnant women with spontaneous abortion (n = 160)
From: Factors associated with fetal karyotype in spontaneous abortion: a case-case study
|  | n (%) or Mean ± SD |  | n (%) or Mean ± SD |
|---|---|---|---|
Maternal age (years) | 30.8 ± 5.0 | No. of previous miscarriages |  |
Paternal age (years) | 32.6 ± 6.1 | None | 97 (60.6) |
Ethnicity | Â | One | 49 (30.6) |
 Han | 127 (79.4) | Two or more | 14 (8.8) |
 Ethnic minorities | 33 (20.6) | Folic acid supplementation |  |
Education | Â | No | 32 (20.0) |
  ≤ Middle school | 48 (30.0) | Yes | 128 (80.0) |
  ≥ College | 112 (70.0) |  |  |
Place of residence |  | Serum homocysteine (μmol/L) | 7.6 ± 2.5 |
 Urban | 127 (79.4) |  |  |
 Suburban & rural | 33 (20.6) | Maternal BMI (kg/m2) | 21.9 ± 3.0 |