Table 4 Odds ratios (95%CI) for depression symptoms on low birth weight stratified by maternal age, residence type, pre-pregnancy BMI and newborn gender

  < 25

4.9 (0.4–57.8)

14.5 (0.6–327.8)

  ≥ 25

2.1 (0.9–4.4)

2.0 (0.9–4.4)

 Shenzhen residence

2.1 (0.5–8.0)

2.2 (0.6–8.7)

 Temporary residence

2.3 (1.0–5.4)

2.4 (1.1–5.6)

  < 25

1.9 (0.9–4.3)

1.8 (0.8–4.3)

  ≥ 25

6.8 (1.2–37.4)

2.8 (0.1–70.0)

 Boy

3.6 (1.4–9.0)

2.0 (0.7–6.1)

 Girl

1.1 (0.3–4.1)

1.3 (0.3–5.7)