Table 1.
Background characteristics of 195 Japanese men with acute myocardial infarction and 331 controls matched for age and occupation, and odds ratios for infarction in relation to established risk factors and psychosocial conditions
| No (%) of subjects
|
|||
|---|---|---|---|
| Cases (n=195) | Controls (n=331) | Odds ratio* (95% CI) | |
| Occupation† | |||
| Managers and officials | 100 (51) | 169 (51) | NA |
| Professional and technical | 29 (15) | 46 (14) | NA |
| Clerical and related | 23 (12) | 31 (9) | NA |
| Sales | 9 (5) | 10 (3) | NA |
| Crafts, production process, construction, and labouring | 23 (12) | 61 (18) | NA |
| Transport and communications | 5 (3) | 9 (3) | NA |
| Services | 5 (3) | 3 (1) | NA |
| Emergency services | 1 (1) | 2 (1) | NA |
| Biomedical history | |||
| Hypertension | 97 (50) | 71 (21) | 3.64 (2.45 to 5.42) |
| Hypercholesterolaemia | 90 (46) | 71 (21) | 3.16 (2.14 to 4.66) |
| Diabetes | 50 (26) | 40 (12) | 2.38 (1.50 to 3.79) |
| Smokers: | |||
| Never | 27 (14) | 78 (24) | 1.00 |
| Former | 47 (24) | 98 (30) | 1.36 (0.77 to 2.40) |
| Current | 121 (62) | 155 (47) | 2.34 (1.41 to 3.87) |
| Body mass index (kg/m2): | |||
| ⩽19.7 | 9 (5) | 31 (9) | 0.64 (0.29 to 1.42) |
| 19.8-24.2 | 98 (50) | 185 (56) | 1.00 |
| 24.3-26.4 | 54 (28) | 77 (23) | 1.34 (0.89 to 2.14) |
| ⩾26.5 | 34 (17) | 38 (11) | 1.37 (1.05 to 1.79) |
| Psychosocial conditions | |||
| Amount of work of sedentary nature(%): | |||
| ⩽24 | 70 (36) | 125 (38) | 1.00 |
| 25-50 | 41 (21) | 67 (20) | 1.03 (0.60 to 1.75) |
| 51-75 | 36 (18) | 77 (23) | 0.77 (0.45 to 1.32) |
| ⩾76 | 48 (25) | 62 (19) | 1.27 (0.75 to 2.14) |
| Burnout index: | |||
| Normal | 143 (73) | 253 (76) | 1.00 |
| Borderline | 41 (21) | 61 (18) | 1.26 (0.80 to 1.97) |
| Burnout | 11 (6) | 17 (5) | 1.31 (0.59 to 2.90) |
*
Adjusted for age and occupation categories by conditional logistic regression.
†
Occupation categories classified in 1990 Japanese census.
NA=Not applicable.