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Table 4 Associations with infant birthweight

From: Stressful life events, social health issues and low birthweight in an Australian population-based birth cohort: challenges and opportunities in antenatal care

  ≥2500 g
No. (%)
< 2500g
No. (%)
OR (95% CI)
Maternal age    
≤24 years 3467 (95.8) 151 (4.2) 1.00 ref
> 24 years 376 (95.4) 18 (4.6) 1.10 (0.7-1.8)
Adjusted household income (AUD)    
< $20,000 830 (95.7) 37 (4.3) 1.00 (0.7-1.5)
$20,000-$40,000 1799 (95.7) 81 (4.3) 1.00 ref
> $40,000 904 (95.9) 39 (4.1) 1.00 (0.6-1.4)
Educational attainment    
Completed year 12 3147 (96.1) 127 (3.9) 1.00 ref
Did not complete year 12 789 (94.0) 50 (6.0) 1.57 (1.1-2.2)
Relationship status    
Married 3035 (95.7) 135 (4.3) 1.00 ref
Living with partner 766 (96.0) 32 (4.0) 0.93 (0.6-1.4)
Single/divorced/separated 160 (93.0) 12 (7.0) 1.69 (0.9-3.1)
Maternal Country of birth    
Australia 3230 (96.1) 130 (3.9) 1.00 ref
Overseas - English speaking 241 (93.8) 16 (6.2) 1.65 (1.0-2.8)
Overseas - Non-English speaking 457 (93.5) 32 (6.5) 1.73 (1.2-2.6)
Risk of complications in pregnancy    
Lower risk 2473 (98.1) 49 (1.9) 1.00 ref
Higher risk 1500 (92.0) 130 (8.0) 4.37 (3.1-6.1)
Maternal pre-pregnant BMI    
Underweight (< 18.5) 163 (92.6) 13 (7.4) 1.74 (1.0-3.2)
Normal weight (18.5-24.9) 2193 (95.6) 100 (4.7) 1.00 ref
Overweight (25.0-29.9) 837 (96.0) 35 (4.0) 0.92 (0.6-1.4)
Obese (≥30) 537 (96.4) 20 (3.6) 0.82 (0.5-1.3)
Smoking in pregnancy    
Non-smoker 3222 (96.1) 132 (3.9) 1. 00 ref
Quit in pregnancy 325 (96.0) 13 (3.9) 0.98 (0.5-1.7)
Smoking throughout pregnancy 343 (92.4) 28 (7.6) 1.99 (1.3-3.0)
Stressful life events/social health issues    
None 1332 (96.8) 44 (3.2) 1.00 ref
One to two issues 1954 (95.7) 88 (4.3) 1.36 (1.0-2.0)
≥3 issues 676 (93.6) 46 (6.4) 2.06 (1.3-3.1)