Research Article
The Association between Job Strain and Atrial Fibrillation: Results from the Swedish WOLF Study
Table 1
Baseline characteristics in the total study sample and among participants with and without atrial fibrillation (AF), the WOLF study, Sweden.
| | Characteristics | Total
n = 10121 | Not AF
n = 9868 | AF
n = 253 | value* |
| | Age, mean (sd) | 42.5 (10.7) | 42.3 (10.7) | 51.3 (8.3) | <0.001 | | Sex, (%) | | | | | | Men | 6971 (69) | 6757 (68) | 214 (85) | <0.001 | | Women | 3150 (31) | 3111 (32) | 39 (15) | | Study part, (%) | | | | | | Stockholm | 5518 (55) | 5368 (54) | 150 (59) | 0.12 | | Norrland | 4603 (45) | 4500 (46) | 103 (41) | | Demand-control, (%) | | | | | | No strain | 8960 (89) | 8739 (89) | 221 (87) | 0.55 | | Job strain | 1161 (11) | 1129 (11) | 32 (13) | | Low strain | 3192 (32) | 3112 (32) | 80 (32) | 0.64 | | Passive | 3259 (32) | 3186 (32) | 73 (29) | | Active | 2509 (25) | 2441 (25) | 68 (27) | | High strain | 1161 (11) | 1129 (11) | 32 (13) | | SES, (%) | | | | | | Manual workers | 4422 (44) | 4310 (44) | 112 (44) | | Lower level/
intermediate nonmanual employees | 4341 (43) | 4242 (44) | 99 (39) | 0.09 | | Professionals | 1234 (12) | 1192 (12) | 42 (17) | | | Physical exercise, (%) | | | | | | Seldom | 2488 (25) | 2420 (25) | 68 (27) | 0.64 | | Sometimes | 3876 (38) | 3781 (38) | 95 (38) | | Regularly | 3727 (37) | 3639 (37) | 88 (35) | | Smoking, (%) | | | | | | Never smokers | 4739 (48) | 4664 (48) | 75 (30) | <0.001 | | Ex-smokers | 2893 (29) | 2788 (29) | 105 (42) | | Current smokers | 2250 (23) | 2182 (23) | 68 (27) | | Alcohol consumption, (%) | | | | | | Non | 487 (5) | 470 (5) | 17 (7) | 0.37 | | Moderate | 8688 (88) | 8476 (88) | 212 (87) | | Intermediate | 318 (3) | 311 (3) | 7 (3) | | Heavy | 401 (4) | 394 (4) | 7 (3) | | Waist circumference | | | | | | ≤94.0 (M); ≤80.0 (W) | 6322 (63) | 6211 (63) | 111 (44) |
<0.001 | | 94–101.99 (M); 80–88 (W) | 2241 (22) | 2174 (22) | 67 (26) | | >102 (M); >88 (W) | 1511 (15) | 1436 (15) | 75 (30) | | Hypertension, (%) | | | | | | No | 8043 (80) | 7891 (80) | 152 (60) | <0.001 | | Yes | 2062 (20) | 1961 (20) | 101 (40) |
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Chi2-tests for comparison of proportions, -test for comparisons of continuous variable.
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