|Smoking status||OR||95% CI||OR||CI||OR||CI|
|1 or both parents||1.21||1.10 to 1.34||1.24||1.17 to 1.31||1.40||1.27 to 1.53|
|1 parent||1.04*||0.78 to 1.38||1.18||1.08 to 1.29||1.29||1.11 to 1.51|
|Both parents||1.50||1.29 to 1.73||1.47||1.14 to 1.90||1.67||1.48 to 1.89|
|Mother only||1.36||1.20 to 1.55||1.28||1.19 to 1.38||1.40||1.20 to 1.64|
|Father only||1.07*||0.92 to 1.24||1.14||1.06 to 1.23||1.21||1.09 to 1.34|
Review: parental tobacco smoke increases the risk of asthma and respiratory symptoms in school age children
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