Figure 1From: Second-hand smoke and chronic bronchitis in Taiwanese women: a health-care based study Correlation between the urinary cotinine levels (mg/g creatinine) and the number of cigarettes they reported themselves as being exposed to SHS during the 3 days leading up to the collection of urine specimens. (Spearman correlation coefficients, r = 0.55, p = 0.02, n = 19)Back to article page