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Table 1.

Distribution of characteristics of the overall and never smokers among IROPICAN study participant.

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Table 2.

Adjusted odds ratios (ORs) with 95% confidence intervals (95% CI) of exposure to secondhand smoke and lung cancer in overall and among never smokers in Iran.

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Table 2 Expand

Table 3.

Adjusted odds ratios (ORs) with 95% confidence intervals (95% CI) of exposure to secondhand smoke and lung cancer in never smoker group by age and sex.

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Table 3 Expand