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Table 2 Association between the season of conception with preterm birth and early preterm birth after adjusting for different covariates

From: Association between season of conception, month of conception with preterm birth in China: a population-based retrospective cohort study

 

Season of conception

   

Outcome

Spring

Summer

Autumn

Winter

Preterm birth

    

Crude RR (95%CI)

1.10 (1.04,1.15)

1.00

1.14 (1.09,1.20)

1.28 (1.22,1.34)

Adjusted RR (95%CI)*

    

 Model A

1.10 (1.05,1.15)

1.00

1.14 (1.08,1.20)

1.28 (1.22,1.34)

 Model B

1.10 (1.05,1.15)

1.00

1.14 (1.08,1.20)

1.28 (1.22,1.34)

 Model C

1.10 (1.05,1.16)

1.00

1.14 (1.08,1.20)

1.28 (1.22,1.35)

 Model D

1.10 (1.05,1.16)

1.00

1.15 (1.09,1.21)

1.28 (1.22,1.34)

Early preterm birth

    

Crude OR (95%CI)

1.09 (1.01,1.18)

1.00

1.09 (1.01,1.19)

1.16 (1.08,1.25)

Adjusted OR (95%CI)*

    

 Model A

1.09 (1.01,1.18)

1.00

1.09 (1.01,1.19)

1.16 (1.08,1.25)

 Model B

1.09 (1.01,1.18)

1.00

1.09 (1.01,1.19)

1.16 (1.08,1.25)

 Model C

1.09 (1.01,1.18)

1.00

1.10 (1.01,1.19)

1.17 (1.09,1.26)

 Model D

1.09 (1.01,1.18)

1.00

1.10 (1.00,1.19)

1.18 (1.09,1.27)

  1. *Model A adjusted for sociodemographic characteristics (age, ethnicity, education level, occupation);Model B adjusted for those factors included in model A and reproductive characteristics (first gestation, primipara, history of preterm birth, history of spontaneous abortion, history of induced abortion, history of stillbirth);Model C adjusted for those factors included in model B and health status (BMI, anemia, HBsAg);Model D adjusted for those factors included in model C and living habits during pregnancy (eating meat and eggs, no eating vegetables, smoking, drinking alcohol, taking folic acid)
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Reproductive Health

ISSN: 1742-4755