Table 1

Comparison of treatment groups by demographic factors at entry to study

Factors	AS (n=109)	AS+NRT (n=136)	p value (χ² test)
NRT = nicotine replacement therapy; AS = advice and support; IHD + risks = ischaemic heart disease and risk factors for this (hyperlipidaemia, diabetes, family history, etc); COPD = chronic obstructive pulmonary disease.
Age (years)
<40	10	21
40–49	18	33	0.1309
50–59	34	35
≥60	47	46
Sex
Male	55	57
Female	54	79	0.1821
Disease
IHD + risks	22	29
COPD	40	54	0.9491
Other lung disease	29	31
Vascular disease	6	6
Other disease	12	16
No of cigarettes smoked
≤15	29	37
16–25	49	51	0.4636
>25	31	47
Partner smokes
Yes	38	68	0.0540 (including no partner)
No	32	35
No partner	38	33	p = 0.1200 (excluding no partner)
Not stated	1	0