Table 1.
Baseline characteristics of participants in Prediction for Atherosclerotic Cardiovascular Disease Risk in China (China-PAR) project and according to quarters of PM2.5* concentrations. Values are numbers (percentages) unless stated otherwise
| Characteristics | Total cohort | Quarters of PM2.5 levels | |||
|---|---|---|---|---|---|
| First (31.2-54.5 μg/m3) | Second (54.6-59.6 μg/m3) | Third (59.7-78.2 μg/m3) | Fourth (78.3-97.0 μg/m3) | ||
| No of participants | 117 575 | 28 540 | 30 751 | 28 951 | 29 333 |
| Mean (SD) PM2.5 level (µg/m3) | 64.9 (14.2) | 48.3 (5.8) | 57.0 (1.6) | 71.1 (7.7) | 83.3 (1.8) |
| Mean (SD) age at baseline (years) | 50.9 (11.8) | 50.6 (10.3) | 51.2 (12.9) | 50.4 (12.3) | 51.4 (11.6) |
| Men | 48 225 (41.0) | 12 279 (43.0) | 12 110 (39.4) | 11 997 (41.4) | 11 839 (40.4) |
| Smoking status: | |||||
| Never | 84 797 (72.4) | 19 867 (69.9) | 22 156 (72.7) | 20 519 (71.1) | 22 255 (76.0) |
| Former | 4358 (3.7) | 1148 (4.0) | 979 (3.2) | 1472 (5.1) | 759 (2.6) |
| Current | 27 921 (23.9) | 7416 (26.1) | 7334 (24.1) | 6889 (23.9) | 6282 (21.4) |
| Education: | |||||
| Less than high school | 100 364 (85.8) | 23 252 (82.3) | 27 300 (89.3) | 24 294 (84.1) | 25 518 (87.1) |
| High school or above | 16 650 (14.2) | 5012 (17.7) | 3285 (10.7) | 4589 (15.9) | 3764 (12.9) |
| Work related physical activity: | |||||
| Vigorous or moderate level | 65 201 (55.6) | 17 100 (60.2) | 16 414 (53.6) | 15 910 (55.1) | 15 777 (53.9) |
| Light or sedentary level | 33 159 (28.3) | 8628 (30.4) | 9152 (29.9) | 7772 (26.9) | 7607 (26.0) |
| No job or retirement | 18 829 (16.1) | 2673 (9.4) | 5035 (16.5) | 5218 (18.1) | 5903 (20.2) |
| Urban residence | 14 456 (12.3) | 6698 (23.5) | 972 (3.2) | 3473 (12.0) | 3313 (11.3) |
| Alcohol drinker | 22 924 (19.5) | 7300 (25.6) | 6299 (20.5) | 3931 (13.6) | 5394 (18.4) |
| Mean (SD) body mass index | 23.6 (3.6) | 22.8 (3.5) | 23.0 (3.4) | 23.8 (3.5) | 24.6 (3.7) |
| Mean (SD) systolic blood pressure (mm Hg) | 127.6 (21.2) | 121.4 (18.5) | 126.9 (19.2) | 126.7 (21.0) | 135.2 (23.3) |
| Mean (SD) diastolic blood pressure (mm Hg) | 78.8 (11.7) | 75.8 (11.2) | 77.6 (11.1) | 78.6 (11.4) | 83.2 (11.8) |
| Diabetes | 6137 (5.5) | 967 (3.8) | 1289 (4.5) | 1947 (7.0) | 1934 (6.7) |
| Hypercholesterolemia | 5014 (4.5) | 1649 (6.5) | 766 (2.7) | 1257 (4.4) | 1342 (4.7) |
*
Particles of diameter ≤2.5 μm.