Table 3 Relative risk (RR) of miscarriage vs ongoing pregnancy in three gestational age groups by women’s characteristics
Miscarriage v. Ongoing 6,0–7,6 Weeks RR (95% CI) | Miscarriage v. Ongoing 8,0–11,6 Weeks RR (95% CI) | Miscarriage v. Ongoing 12,0–19,6 Weeks RR (95% CI) | |
|---|---|---|---|
Maternal age (years) | |||
≤ 20 | 1.26 (0.94, 1.69) | 1.12 (0.95, 1.33) | 0.94 (0.80, 1.10) |
21–25 | REF | REF | REF |
26–30 | 1.11 (0.80, 1.53) | 1.06 (0.90, 1.26) | 1.09 (0.93, 1.29) |
> 30 | 1.17 (0.64, 2.14) | 1.42 (1.05, 1.93) | 1.81 (1.37, 2.38) |
Maternal education | |||
No formal education | 0.93 (0.59, 1.46) | 0.94 (0.71, 1.23) | 1.12 (0.86, 1.46) |
Primary | REF | REF | REF |
Secondary | 0.95 (0.69, 1.32) | 1.10 (0.92, 1.31) | 1.42 (1.20, 1.68) |
University+ | 1.00 (0.61, 1.62) | 0.89 (0.68, 1.16) | 0.93 (0.68, 1.27) |
Parity | |||
0 | 0.78 (0.57, 1.07) | 0.73 (0.60, 0.89) | 0.89 (0.75, 1.06) |
1–2 | REF | REF | REF |
> 2 | 1.30 (0.88, 1.91) | 1.11 (0.84, 1.48) | 1.08 (0.83, 1.41) |
BMI (kg/m2) | |||
Underweight, < 18.5 kg/m2 | 1.00 (0.85, 1.19) | 1.02 (0.96, 1.08) | 1.00 (0.86, 1.17) |
Normal weight, 18.5–25 kg/m2 | REF | REF | REF |
Overweight /obese, > 25 kg/m2 | 0.61 (0.41, 0.91) | 0.89 (0.68, 1.16) | 0.99 (0.77, 1.29) |
Hemoglobin (gm/dl) | |||
Severe/Moderate, ≤ 9 g/dl | 0.77 (0.61, 0.98) | 0.86 (0.70, 1.06) | 0.93 (0.74, 1.17) |
Mild, > 9–11 g/dl | 0.75 (0.61, 0.92) | 0.81 (0.70, 0.93) | 1.00 (0.86, 1.15) |
Normal, > 11 g/dl | REF | REF | REF |