The fact that cigarette smoking became less fashionable among upper-income and middle-income groups lulled the public into believing that the United States was well on its way to ending the enormous toll taken by smoking
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Beijing: Peoples Medical Publishing House (2012)
Subgroup analysis by study design showed that the pooled OR of cohort studies was unadjusted 1.18 (95% CI: 0.961.44, I 2 =77%, p=0.11) and adjusted 1.18 (0.96-1.44, I 2 =77%, p=0.11), while that of case-control studies was unadjusted 1.12 (95% CI: 1.031.21, I 2 =28%, p=0.005) and adjusted 1.10 (95% CI: 1.001.20, I 2 =34%, p=0.05)
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