Table 2 Mean number of cigarettes per day at first and last examinations in moderate smokers, reducers and heavy smokers, by sex.

	Moderate smokers	Reducers	Heavy smokers
Men
First examination	9.2	22.9	18.8
Last examination	10.6	9.7	18.3
Women
First examination	8.1	19.5	17.0
Last examination	9.2	8.6	16.4

Table 4 shows the number of participants in each category.