Table I.

Characteristics of the study population.

	Exercise group		Reference group
	n	Mean (SD) or %	n	Mean (SD) or %	P
n	40		41
Age, years		49.1 (8.1)		47.4 (8.6)
Women, %	16	40.0	18	43.9	0.72
Educational level					0.99
Compulsory education only	3	7.5	2	4.9
Vocational training	5	12.5	8	19.5
Upper secondary school	12	30.0	12	29.3
College or university	20	50.0	19	46.3
Marital status					0.45
Never married	2	5.0	3	7.3
Married or cohabiting	35	87.5	36	87.8
Divorced or widowed	3	7.5	2	4.9
Smoking habits					0.42
Never smoked	25	62.5	20	46.8
Ex-smokers	12	30.0	19	46.3
Current smokers	3	7.5	2	4.9

SD = standard deviation.