Table 1.

Subgroups by classification tree analysis (Fig. 1) of self-rated health status and health determinants, the CARDIA Study, Year 15, USA.

Subgroup/ Node number (predominant SRH status)	Number in subgroup N	% ‘higher’ self-rated health	Description of node characteristics
22	603	92.9	Physical activity in the past year is more than moderately active or very active; total family income is >=$25,000-$34,999; chronic burden due to serious on-going personal health problem (no, or yes, but not very stressful); no history of high blood pressure; grade of school completed is higher than college
higher
21	145	77.9	Physical activity in the past year is more than moderately active or very active; total family income is >=$25,000-$34,999; chronic burden due to serious on-going personal health problem (no, or yes, but not very stressful); no history of high blood pressure; grade of school completed is less than college
higher
25	613	75.4	Physical activity in the past year is moderately active or less than moderately active, or physically inactive; no chronic burden due to serious ongoing personal health problem; grade of school completed is higher than college; no history of high blood pressure; physical activity in the past year is moderately active
higher
14	93	71.0	Physical activity in the past year is more than moderately active or very active; total family income is >=$25,000-$34,999; chronic burden due to serious on-going personal health problem (no, or yes, but not very stressful); history of high blood pressure
higher
3	272	59.9	Physical activity in the past year is more than moderately active or very active; total family income is <=$25,000-$34,999
higher
8	63	57.1	Physical activity in the past year is more than moderately active or very active; total family income is >=$25,000-$34,999; chronic burden due to serious on-going personal health problem (yes, moderately stressful or yes, very stressful)
higher
26	259	56.8	Physical activity in the past year is moderately active or less than moderately active, or physically inactive; no chronic burden due to serious ongoing personal health problem; grade of school completed is higher than college; no history of high blood pressure; physical activity in the past year is less than moderately active or physically inactive
higher
23	455	54.9	Physical activity in the past year is moderately active or less than moderately active, or physically inactive; no chronic burden due to serious ongoing personal health problem; grade of school completed is less than college; degree of difficulty paying for basics is ‘not hard’; no chronic burden due to ongoing difficulties with job
higher
20	153	41.8	Physical activity in the past year is moderately active or less than moderately active, or physically inactive; chronic burden due to serious on-going personal health problem (yes, but not very stressful or yes, moderately stressful or yes, very stressful); can trust neighbours; grade of school completed is higher than college
lower
27	53	41.5	Physical activity in the past year is moderately active or less than moderately active, or physically inactive; no chronic burden due to serious ongoing personal health problem; grade of school completed is higher than college; history of high blood pressure; cigarettes smoked per day is <= 12.5
lower
28	58	37.9	Physical activity in the past year is moderately active or less than moderately active, or physically inactive; no chronic burden due to serious ongoing personal health problem; grade of school completed is higher than college; history of high blood pressure; cigarettes smoked per day is >= 12.5
lower
24	191	37.2	Physical activity in the past year is moderately active or less than moderately active, or physically inactive; no chronic burden due to serious ongoing personal health problem; grade of school completed is less than college; degree of difficulty paying for basics is ‘not hard’; chronic burden due to ongoing difficulties with job (yes, but not very stressful, or yes, moderately stressful, or yes, very stressful)
lower
16	251	31.5	Physical activity in the past year is moderately active or less than moderately active, or physically inactive; no chronic burden due to serious ongoing personal health problem; grade of school completed is less than college; degree of difficulty paying for basics is ‘hard’
lower
19	158	22.8	Physical activity in the past year is moderately active or less than moderately active, or physically inactive; chronic burden due to serious on-going personal health problem (yes, but not very stressful or yes, moderately stressful or yes, very stressful); can trust neighbors; grade of school completed is less than college
lower
12	281	15.3	Physical activity in the past year is moderately active or less than moderately active, or physically inactive; chronic burden due to serious on-going personal health problem (yes, but not very stressful or yes, moderately stressful or yes, very stressful); cannot trust neighbors
lower
	Total 3648