Table 2

Distribution of risk factors in IQ categories among men in the study sample

		IQ
	N exposed	Low (1–3) N=555	Medium (4–6) N=1080	High (7–9) N=521	p Value
Early life factors
Parent's CVD death, age <65	394	18.9	18.2	17.5	0.83
Low socioeconomic position in childhood	1321	73.2	61.9	47.2	<0.001
Factors in adolescence
BMI	–	21.8	21.7	21.3	0.01
Smoking 1–10 cigarette/day	718	35.3	33.7	27.5	0.01
Smoking >10 cigarette/day	863	43.2	40.6	33.4	0.003
Risk use of alcohol	380	25.2	16.0	11.5	<0.001
Systolic blood pressure	–	129.0	127.8	126.1	<0.001
Factors in adulthood*
Occupation
Non-manual	784	14.05	36.5	58.9	<0.001
Manual	905	62.9	40.5	20.9	<0.001
Self-employed/farmer	170	5.59	9.17	6.72	0.02
Unclassified	327	17.5	13.9	13.4	0.10
Income†	–	158.1	177.9	209.3	<0.001
Single household		50.5	39.5	37.0	<0.001
Other diagnoses
Comorbidity‡	75	3.78	3.24	3.65	0.83
Complications§	119	5.59	5.19	6.14	0.73

*Occupation and income in 1990, at age about 40. Single household at the year or preceding year of first CHD event.
†In 1000 Swedish kronor/year.
‡Diabetes with complications, pulmonary oedema, acute or chronic renal failure, cerebrovascular disease, malignancy and depression.
§Cardiogenic shock, cardiac dysrhythmias and congestive heart failure.
BMI, body mass index; CHD, coronary heart disease; CVD, cardiovascular diseases.