Table 14.

Mean pattern of clinical parameters with years of smoking.

Clinical parameters	Pack Years of smoking				P value
	<1 years	1–5 years	5–15 years	>15 years
PI	1.05 ± 0.31	0.99 ± 0.35	1.16 ± 0.44	1.47 ± 0.59	0.002**
GI	0.69 ± 0.32	0.60 ± 0.26	0.58 ± 0.31	0.69 ± 0.41	0.577
BI	31.04 ± 15.21	25.75 ± 17.20	28.58 ± 15.33	36.29 ± 22.58	0.237
CI	1.64 ± 0.37	1.54 ± 0.35	1.69 ± 0.39	1.81 ± 0.28	0.058