Table 1.

Characteristics of the Sample

Characteristic	All comers (N = 1,091)	Completers (N = 550)
Women	n = 543 (49.8%)	n = 275 (50.0%)
Years of education	M = 10.7, SD = 1.1	M = 10.9, SD = 1.2
Smoking
Never	n = 501 (45.9%)	n = 297 (54.0%)
Yes, but quit	n = 465 (42.6%)	n = 229 (41.6%)
Currently smoke	n = 125 (11.5%)	n = 24 (4.4%)
Social (occupational) class
Professional	n = 190 (17.4%)	n = 125 (22.7%)
Managerial, technical	n = 402 (36.8%)	n = 213 (38.7%)
Skilled, nonmanual	n = 246 (22.5%)	n = 107 (19.5%)
Skilled, manual	n = 188 (17.2%)	n = 77 (14.0%)
Partly skilled	n = 38 (3.5%)	n = 16 (2.9%)
Unskilled	n = 6 (0.5%)	n = 3 (0.5%)