Table 1.
Baseline characteristics of study participants in the CHARLS (N = 4116)
| Characteristics | Total | Quartiles of hs-CRP (mg/L) | P values | |||
|---|---|---|---|---|---|---|
| (%) | Quartile 1 | Quartile 2 | Quartile 3 | Quartile 4 | ||
| (< 0.48) | (≥ 0.48 to < 0.81) | (≥ 0.81 to < 1.63) | (≥ 1.63) | |||
| No. of participants | 4116 | 1027 | 1019 | 1039 | 1031 | |
| Age, mean (SD), years | 58.58 (9.03) | 57.09 (8.75) | 58.51 (9.05) | 59.01 (8.93) | 59.70 (9.17) | < 0.001 |
| Sex, male (%) | 2187 (53.13) | 590 (57.45) | 566 (55.54) | 530 (51.01) | 501 (48.59) | < 0.001 |
| Education level (%) | 0.89 | |||||
| Illiterate | 1931 (46.91) | 488 (47.52) | 486 (47.69) | 474 (45.62) | 483 (46.85) | |
| Primary school | 965 (23.45) | 239 (23.27) | 233 (22.87) | 248 (23.87) | 245 (23.76) | |
| Middle school | 853 (20.72) | 213 (20.74) | 207 (20.31) | 212 (20.40) | 221 (21.44) | |
| High school or above | 367 (8.92) | 87 (8.47) | 93 (9.13) | 105 (10.11) | 82 (7.95) | |
| Residence, urban (%) | 1237 (30.05) | 281 (27.36) | 294 (28.85) | 316 (30.41) | 346 (33.56) | 0.02 |
| Cigarette smoking (%) | < 0.001 | |||||
| Never smoker | 2510 (60.98) | 670 (65.24) | 653 (64.08) | 614 (59.10) | 573 (55.58) | |
| Former smoker | 305 (7.41) | 55 (5.36) | 69 (6.77) | 78 (7.51) | 103 (9.99) | |
| Current smoker | 1301 (31.61) | 302 (29.41) | 297 (29.15) | 347 (33.40) | 355 (34.43) | |
| Alcohol drinking (%) | 0.09 | |||||
| Never drinker | 2397 (58.24) | 622 (60.56) | 595 (58.39) | 592 (56.98) | 588 (57.03) | |
| Former drinker | 308 (7.48) | 61 (5.94) | 66 (6.48) | 91 (8.76) | 90 (8.73) | |
| Current drinker | 1411 (34.28) | 344 (33.50) | 358 (35.13) | 356 (34.26) | 353 (34.24) | |
| BMI, mean (SD), kg/m2 | 22.66 (3.39) | 21.97 (3.00) | 22.66 (3.30) | 22.86 (3.37) | 23.13 (3.76) | < 0.001 |
| WC, mean (SD), cm | 81.35 (11.65) | 79.40 (10.74) | 80.95 (11.93) | 82.22 (10.68) | 82.80 (12.84) | < 0.001 |
| FBG, mean (SD), mg/dl | 102.66 (23.79) | 100.77 (20.67) | 103.50 (22.93) | 102.88 (22.87) | 103.48 (28.00) | 0.02 |
| Diastolic BP, mean (SD), mmHg | 73.75 (11.69) | 72.71 (11.41) | 73.56 (11.91) | 74.01 (11.59) | 74.73 (11.76) | 0.01 |
| Systolic BP, mean (SD), mmHg | 128.96 (51.54) | 126.87 (48.62) | 127.46 (43.44) | 130.91 (64.44) | 130.54 (46.83) | 0.17 |
| TG, mean (SD), mg/dl | 101.93 (50.12) | 96.76 (48.94) | 100.86 (46.83) | 106.56 (52.65) | 103.45 (51.35) | < 0.001 |
| HDL-C, mean (SD), mg/dl | 55.46 (14.25) | 58.30 (15.32) | 56.06 (14.13) | 53.97 (13.48) | 53.53 (13.53) | < 0.001 |
| Hypertension (%) | 1,266 (30.76) | 270 (26.29) | 311 (30.52) | 324 (31.18) | 361 (35.01) | < 0.001 |
| Dyslipidemia (%) | 590 (14.33) | 124 (12.07) | 120 (11.78) | 176 (16.94) | 170 (16.49) | < 0.001 |
| Diabetes (%) | 367 (8.92) | 78 (7.59) | 96 (9.42) | 97 (9.34) | 96 (9.31) | 0.40 |
| Heart disease (%) | 398 (9.67) | 87 (8.47) | 90 (8.83) | 98 (9.43) | 123 (11.93) | 0.04 |
| Stroke (%) | 62 (1.51) | 17 (1.66) | 9 (0.88) | 20 (1.92) | 16 (1.55) | 0.26 |
BMI, body mass index; BP, blood pressure; CHARLS, China Health and Retirement Longitudinal Study; FBG, fasting blood glucose; HDL-C, high-density lipoprotein cholesterol; hs-CRP, high-sensitive C-reactive protein; SD, standard deviation; TG, triglycerides; WC, waist circumference