Main Organiser

Julius Centre University of Malaya


Department of Social and Preventive Medicine, Faculty of Medicine, University of Malay

Supported by

University of Malaya



Norsa'adah B 1 , Salinah O 2


1 Unit of Biostatistics and Research Methodology, School of Medical Sciences, Universiti Sains Malaysia
2 State Health Department, Melaka, Malaysia


Objectives: This study was conducted to determine the effect of exposure to secondhand smoke during pregnancy on the newborn weight.

Methods: A retrospective cohort study was conducted among post-partum women. Exposed group comprised of 209 postnatal Malay women with secondhand smoke exposure and non- exposed group included 211 women without secondhand smoke exposure. The selection of women was done by including all the eligible women in each postnatal ward consecutively. Information on maternal and foetal factors was obtained from interview, antenatal cards and labour notes. The exposure status was ascertained by using questionnaires based on the self-reported exposure to secondhand smoke at home and workplace.

Results: There was a significant different in the adjusted mean birth weight [95% confidence interval (CI)] between exposed [2893.0 grams (2781.3, 3004.7)] and non-exposed women to secondhand smoke [3046.1 grams (2929.5, 3162.6)], p value <0.002 after controlling significant maternal factors. There was 12.9 grams (95% CI: 7.01, 18.96) reduction of birth weight by the increased of one cigarette smoke exposed (p value <0.001). The incidence (95% CI) of LBW was higher in exposed women with the incidence of 10% (5.94, 14.06) compared to non-exposed women with incidence of 4.7% (1.85, 7.55). Significant factors associated with LBW were gestational duration, previous history of LBW, maternal height and parity status.

Conclusion: The findings of this study had contributed to the pool of literatures which had demonstrated a significant association in the decrement of birth weight following secondhand smoke exposure during pregnancy.