Intervention rate ratios for influenza infection.
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aIntracluster correlation coefficient: −0.0014 in unadjusted model (N = 1,111), −0.0030 in model adjusting for gender, race, ethnicity, smoking status, physical activity, and having ever received a vaccination for influenza (N = 986).bcRR = Cumulative Rate Ratio is the week by treatment effect which is equivalent to the hazard ratio over the study period.c95% CI, 95% confidence interval. Significance level set at P
创建时间：
2015-12-02
