From: Cigarette smoking: an important renal risk factor – far beyond carcinogenesis
Cases
Controls
95%-confidence intervall
Pack-years
(n, [%])
Odds ratio
p-value*
0–5
26 [36]
47 [65]
1.0
-
5–15
17 [24]
11 [15]
3.5
1.3–9.6
0.017
>15
29 [40]
14 [19]
5.8
2.0–17
0.001