Table 1.
Demographic and health characteristics of the study population in Wave 1 among the different TC groups.
| Q1 (n = 3,607) | Q2 (n = 1,850) | Q3 (n = 605) |
Q4 (n = 315) |
P value | |
|---|---|---|---|---|---|
| Continuous variables | |||||
| Age, years | 58.4 ± 8.9 | 58.3 ± 8.6 | 58.8 ± 8.5 | 58.8 ± 8.2 | 0.418 |
| Mean TCa, mmol/L | 4.8 ± 0.8 | 4.9 ± 0.8 | 5.1 ± 0.9 | 5.4 ± 1.1 | < 0.001 |
| Categorical variables, n (%) | |||||
| Male | 1647 (45.7) | 829 (44.8) | 266 (44.0) | 150 (47.8) | 0.664 |
| Education | 0.579 | ||||
| Illiterate | 905 (25.1) | 494 (26.7) | 173 (28.6) | 91 (28.9) | |
| Primary school | 1562 (43.3) | 789 (42.3) | 258 (42.7) | 135 (42.9) | |
| Middle school | 771 (21.4) | 383 (21.2) | 113 (18.7) | 60 (19.1) | |
| High school and above | 368 (10.2) | 174 (9.4) | 60 (9.9) | 29 (9.2) | |
| Marital status | 0.743 | ||||
| Married | 3,244 (89.9) | 1671 (90.3) | 550 (90.9) | 281 (91.1) | |
| Other status | 363 (10.1) | 179 (9.7) | 55 (9.1) | 38 (8.9) | |
| Residential area | 0.004 | ||||
| Urban | 612 (16.6) | 299 (15.8) | 88 (13.5) | 75 (23.0) | |
| Rural | 3,076 (83.4) | 1,590 (84.2) | 537 (85.9) | 251 (77.0) | |
| Depression | 0.015 | ||||
| Yes | 264 (7.1) | 108 (5.7) | 58 (9.3) | 26 (8.0) | |
| No | 3,431 (92.9) | 1784 (94.3) | 567 (90.7) | 300 (92.0) | |
| BMI (kg/m2) | 0.115 | ||||
| < 18.5 | 561 (15.2) | 264 (14.0) | 87 (13.4) | 50 (15.3) | |
| 18.5–28 | 2,742 (74.2) | 1,392 (736.) | 464 (74.2) | 227 (69.6) | |
| > 28 | 392 (10.6) | 236 (12.5) | 74 (11.8) | 49 (15.0) | |
| Current smoker | 1,408 (38.1) | 734 (38.8) | 229 (36.6) | 136 (41.7) | 0.460 |
| Current drinker | 873 (23.6) | 501 (26.5) | 166 (26.6) | 97 (29.8) | 0.014 |
| Hypertension | 872 (23.6) | 474 (25.1) | 192 (30.7) | 105 (42.2) | < 0.001 |
| Dyslipidaemia | 346 (9.4) | 177 (9.4) | 76 (12.2) | 43 (13.2) | 0.025 |
| Diabetes mellitus | 192 (5.2) | 115 (6.1) | 49 (7.8) | 18 (5.5) | 0.056 |
| History of heart disease | 423 (11.5) | 236 (12.5) | 82 (13.1) | 45 (13.8) | 0.361 |
| History of stroke | 69 (1.9) | 32 (1.7) | 12 (1.9) | 9 (2.8) | 0.626 |
| Lipid-lowering therapy | 216 (5.9) | 139 (7.4) | 70 (11.2) | 52 (15.9) | < 0.001 |
Four groups were categorized by the SD in TC variability (SD = 0.306 mmol/L): Q1: ≤ 0.306 mmol/L, Q2: 0.306–0,612 mmol/L, Q3: 0.612–0.918 mmol/L, Q4: > 0.918 mmol/L.