Table 3.

Odds ratio for chronic renal failure by type among regular smokers

	N (%*)	Ever regular use of cigarettes		OR† (CI 95%)	P
		No n (%**)	Yes n (%+)
Control	371(65.2)	120(51.7)	251(74.5)	1 Reference	-
Glomerulonephritis	90 (15.8)	59(25.4)	31(9.1)	1.09(0.67-1.78)	0.7
Diabetic nephropathy	56 (9.8)	27(11.6)	29(8.6)	2.24(1.27-3.96)	0.005
Hypertension	26 (4.6)	11(4.8)	15(4.5)	2.85(1.27-6.39)	0.011
Unknown and other causes	26 (4.6)	15(6.5)	11(3.3)	1.53(0.68-3.44)	0.2

*Of all subjects (n = 569). **Of never regular smokers (n = 232). ⁺Of ever regular smokers (n = 337). ^† Adjusted by age and gender.