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Table 2 Multivariate analysis of factors associated with preterm birth (n = 49,898)

From: Incidence, risk factors and consequences of preterm birth – findings from a multi-centric observational study for 14 months in Nepal

Variables β – coefficient p-value aOR (95% CI)
Age of mother
 20- < 35 years Ref   
 < 20 years 0.234 < 0.001 1.26 (1.15–1.39)
 > 35 years 0.180 0.082 1.20 (0.98–1.47)
Education level of mother
 Secondary and higher Ref   
 Illiterate 0.346 < 0.001 1.41 (1.22–1.64)
 Literate 0.186 0.001 1.21 (1.08–1.35)
 Basic education 0.152 0.001 1.17 (1.07–1.27)
Parity of mother
 Multipara Ref   
 Nullipara 0.285 < 0.001 1.33 (1.20–1.48)
 Primipara −0.013 0.812 0.99 (0.89–1.20)
Time of first ANC visit
 First trimester Ref   
 Second trimester 0.125 0.001 1.13 (1.05–1.22)
 Third trimester 0.218 < 0.001 1.24 (1.12–1.38)
ANC visits during pregnancy    
 ≥4 visits Ref   
 < 4 visits 0.398 < 0.001 1.49 (1.38–1.61)
Smoking
 No Ref   
 Yes 0.121 0.035 1.13 (1.01–1.26)
Type fuel
 Clean Ref   
 Polluted 0.230 < 0.001 1.26 (1.17–1.35)
Severe anaemia
 No Ref   
 Yes 1.185 < 0.001 3.27 (2.21–4.84)
Multiple delivery
 No Ref   
 Yes 1.891 < 0.001 6.63 (5.16–8.52)
Sex of the baby
 Boy Ref   
 Girl 0.164 < 0.001 1.18 (1.11–1.26)
Major malformation
 No Ref   
 Yes 0.644 0.171 1.90 (0.76–4.78)