Age mean (SD) | 56 (5)* | 54 (5) | 57 (6)* | 55 (5) |
Cigarettes/day | 20 (12)* | 17 (12) | 10 (9) | 8 (9) |
Social class n (%) | | | | |
I | 8 (7) | 169 (7) | 0 (0)* | 95 (3) |
II | 23 (20) | 397 (16) | 2 (6) | 601 (18) |
IIIN | 16 (14) | 296 (12) | 6 (18) | 900 (27) |
IIIM | 41 (35) | 899 (37) | 11 (34) | 480 (14) |
IV | 18 (16) | 529 (21) | 8 (24) | 895 (27) |
V | 9 (8) | 172 (7) | 6 (18) | 351 (11) |
Marital status n (%) | | | | |
Married | 102 (88) | 2140 (87) | 19 (58)** | 2345 (70) |
Widowed | 3 (3) | 88 (4) | 12 (36) | 455 (14) |
Single | 7 (6) | 207 (8) | 2 (6) | 440 (13) |
Other | 3 (3) | 27 (1) | 0 (0) | 82 (3) |
Mean (SD) of CHD risk factor | | | | |
Systolic BP mm Hg | 152 (23)** | 146 (22) | 166 (32)** | 146 (24) |
Diastolic BP mm Hg | 87 (13)* | 85 (13) | 90 (16)** | 83 (13) |
Cholesterol mmol/l | 6.1 (1)** | 5.9 (1) | 7 (2) | 7 (1) |
Body mass index kg/m2 | 26 (3) | 26 (3) | 27 (5)* | 25 (4) |
Forced expiratory volume (1 sec) | 87 (24) | 89 (23) | 89 (28) | 92 (23) |
Blood sugar mmol/l | 5 (1) | 5 (1) | 6 (4)** | 5 (1) |
Angina n (%) | | | | |
No | 75 (65)** | 2063 (84) | 24 (73)* | 2862 (86) |
Yes | 40 (35) | 399 (16) | 9 (27) | 460 (14) |
Bronchitis n (%) | | | | |
No | 108 (94) | 2323 (94) | 32 (97) | 3211 (97) |
Yes | 7 (6) | 139 (6) | 1 (3) | 111 (3) |
ECG ischaemia n (%) | | | | |
No | 95 (83)** | 2246 (91) | 24 (73)** | 3024 (91) |
Yes | 20 (17) | 216 (9) | 9 (27) | 298 (9) |
Stroke n (%) | | | | |
No | 111 (96)* | 2342 (99) | 33 (100) | 3295 (99) |
Yes | 4 (4) | 30 (1) | 0 (0) | 27 (1) |
Diabetes n (%) | | | | |
No | 111 (96) | 2430 (99) | 30 (91)** | 3293 (99) |
Yes | 4 (4) | 32 (1) | 3 (9) | 29 (1) |