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Table 4 Factors associated with low birth weight. Salavan Province, Laos, 2014

From: Prevalence of malaria in pregnancy in southern Laos: a cross-sectional survey

  Univariate analysisa P value Multivariate analysisa P value
Crude IRR (95 % CI) Adjusted IRR (95 % CI)
Age (years) (20–24 = Ref)   0.36   
 <20 1.54 (0.92–2.60)    
 25–27 1.16 (0.65–2.06)    
 ≥28 1.01 (0.60–1.68)    
Primigravidity 1.26 (0.85–1.87) 0.25   
Tobacco use 2.50 (1.68–3.72) <10−3 2.43 (1.64–3.60) <0.001
Ethnicity Lao Theung (Ref = Lao Loum) 1.57 (1.03–2.39) 0.04   
Place of living (Ref = Salavan)   0.17   
 Vapi 0.66 (0.31–1.44)    
 Toumlane 1.51 (0.93–2.44)    
 Others 0.74 (0.26–2.13)    
Went to the forest during the current pregnancy 1.22 (0.83–1.82) 0.30   
No bed net use 2.07 (1.27–3.36) 0.003 1.56 (0.92–2.64) 0.10
Number of ANC visits (≥4=Ref)   0.01   
1–3 1.41 (0.94–2.13)    
0 2.53 (1.34–4.77)    
Gestational hypertension 1.26 (0.48–3.33) 0.64   
Moderate anaemia at delivery 1.25 (0.84–1.87) 0.28   
Duration of pregnancy (weeks gestation) (37–38 = Ref)   <10−3   <0.001
 ≥39 0.49 (0.25–0.99)   0.49 (0.25–0.97)  
 <37 3.47 (2.51–4.81)   3.17 (2.19–4.57)  
Female 1.15 (0.77–1.70) 0.50   
  1. IRR incidence rate ratio
  2. aThe analysis was conducted using a modified Poisson regression. Only live-singletons were included. The multivariate analysis was performed on 313 women. The final model was obtained after a backward selection procedure, bed net use was forced in the final model