Table 2 Smoking status and Odds ratio for chronic renal failure

Ever regular smoking

   No

112

56.5

251

67.7

1 (Reference)

-

   Yes

86

43.4

120

32.3

1.6 (1.12-2.29)

0.009

Regular smoking

   Former

30

15.1

43

11.6

1.04(0.58-1.86)

0.8

   Current

56

28.2

77

20.8

1.63(1.08-2.45)

0.02

No. of pack/years, cigarettes

   1-15

34

17.1

60

16.1

2.1(0.96-4.57)

0.06

   16-30

16

8

29

7.8

2.04(1.08-3.88)

0.028

   > 30

36

18.1

31

8.3

2.6(1.53-4.41)

0.000