Influence of smoking dose on the risk of a 30% decline in eGFR.

HR, hazard ratio; CI, confidence interval.
Data are the HR, 95% CI, and P value from Cox proportional hazard regression analyses.
“Never smoked” was used as the reference category. Models 1 and 2 are based on data from 168 patients because the number of cigarettes was missing for 1 current and 2 ex-smokers. Adjusted for baseline characteristics (age, sex, systolic/diastolic pressure, serum creatinine level, urinary protein, use of angiotensin-converting enzyme inhibitor or angiotensin receptor blocker within 6 months after kidney biopsy, and immunosuppressive therapy within 6 months after kidney biopsy).