Table 2 Logistic regression analysis for LBW and its determinants

Maternal age (at child birth)

0.96 (0.94–0.99)

0.96 (0.92–1.00)

Maternal education

University

1.0 (ref.)

1.0 (ref.)

Illiterate and primary

3.87 (0.93–16.00)

3.32 (0.79–13.94)

Secondary and high school

4.29 (1.05–17.54)

3.44 (0.83–14.25)

Number of parities

0.98 (0.86–1.12)

1.01 (0.85–1.20)

History of LBW deliveries

No

1.0 (ref.)

1.0 (ref.)

Yes

1.94 (1.07–3.51)

2.53 (1.06–6.03)

History of pre term labor

No

1.0 (ref.)

1.0 (ref.)

Yes

1.41 (0.70–2.84)

0.65 (0.23–1.81)

Cigarette smoking

No

1.0 (ref.)

1.0 (ref.)

Yes

3.74 (1.63–8.54)

4.64 (1.97–10.95)

Chronic diseases

None

1.0 (ref.)

1.0 (ref.)

Hypertension

3.11 (1.93–5.02)

3.70 (2.25–6.06)

Others

1.91 (1.03–3.53)

2.04 (1.09–3.83)

Residence

Tehran

1.0 (ref.)

1.0 (ref.)

Suburbs of Tehran

1.41 (1.04–1.92)

1.24 (0.90–1.71)