[Table/Fig-5]:

Comparison of four sub-groups of cigarette smokers based on cigarette (pack) years

	Group I (n=14) (1-50 cigarette years)	Group II (n=15) (51-100 cigarette years)	Group III (n=12) (101-150 cigarette years)	Group IV (n=8) (151-230 cigarette years)	p value
Age (in years)	22.82 ± 3.28	26.66 ± 3.59	28.90 ± 4.10	36.22 ± 2.81	0.001
Cigarette years	30.61 ± 10.47	73.80 ± 16.52	127.27 ± 9.66	189.22 ± 27.51	0.001
PEFR (lpm)	494.70 ± 79.22	443.33 ± 45.14	350.90 ± 32.38	300.00 ± 46.90	0.001

(Values are expressed as Mean + SD and comparison was done using one way ANOVA. * indicates the statistical significance at p value <0.05; lpm= litres per minute)