Table 1 Demographic and baseline clinical characteristics of patients
Spring (n = 93) | Summer (n = 72) | Autumn (n = 151) | Winter (n = 124) | t/Z/χ2 | P | |
|---|---|---|---|---|---|---|
Male n (%) | 53 (57.0) | 45 (62.5) | 87 (57.6) | 75 (60.5) | 0.752 | 0.861 |
Age (years) | 60.4 ± 13.3 | 57.7 ± 12.9 | 59.6 ± 12.9 | 56.3 ± 11.3 | 2.427 | 0.065 |
Diabetes mellitus | 13 (14.0) | 14 (19.4) | 16 (10.6) | 14 (11.3) | 3.825 | 0.281 |
Duration of diabetes mellitus (years) | 10.00 (7.53,10.00) | 3.50 (0.83,6.25) | 2.00 (2.00,9.25) | 8.00 (3.25,12.00) | 3.756 | 0.289 |
Current smoker n (%) | 22 (23.7) | 16 (22.2) | 30 (19.9) | 21 (16.9) | 1.700 | 0.637 |
Duration of smoker (years) | 22 (23.7) | 16 (22.2) | 30 (19.9) | 21 (16.9) | 1.700 | 0.637 |
CAD n (%) | 3 (3.2) | 5 (6.9) | 6 (4.0) | 3 (2.4) | 2.411 | 0.492 |
PCI n (%) | 0 (0.0) | 2 (2.8) | 4 (2.6) | 4 (3.2) | 4.894 | 0.180 |
Previous myocardial infarction n (%) | 1 (1.1) | 3 (4.2) | 5 (3.3) | 1 (0.8) | 3.915 | 0.271 |
Family history of hypertension n (%) | 3 (3.2) | 5 (6.9) | 6 (4.0) | 3 (2.4) | 2.411 | 0.492 |
Educational Qualifications n (%) | 20.007 | 0.067 | ||||
Illiterate | 18 (19.4) | 13 (18.1) | 34 (22.5) | 19 (15.3) | ||
Primary school | 22 (23.7) | 25 (34.7) | 27 (17.9) | 31 (25.0) | ||
Middle school | 36 (38.7) | 17 (23.6) | 47 (31.1) | 36 (29.0) | ||
High school | 6 (6.5) | 6 (8.3) | 18 (11.9) | 23 (18.5) | ||
Specific colleague course or above | 11 (11.8) | 11 (15.3) | 25 (16.6) | 15 (12.1) | ||
BMI (kg/m2) | 26.06 ± 5.67 | 25.53 ± 3.99 | 25.47 ± 3.96 | 25.55 ± 3.81 | 0.390 | 0.760 |
Clinical SBP (mmHg) | 156.3 ± 24.2 | 150.9 ± 24.9 | 156.9 ± 21.4 | 164.3 ± 22.2 | 5.738 | 0.001 |
Clinical DBP (mmHg) | 93.8 ± 14.9 | 89.4 ± 12.4 | 95.4 ± 14.0 | 100.1 ± 15.1 | 9.100 | < 0.001 |
hs-CRP (mg/L) | 0.61 (0.50,0.99) | 0.53 (0.50,1.02) | 0.60 (0.50,0.89) | 0.79 (0.56,1.09) | 13.651 | 0.003 |
HDL-C (mmol/L) | 1.14 ± 0.33 | 1.21 ± 0.34 | 1.19 ± 0.27 | 1.15 ± 0.25 | 1.063 | 0.364 |
LDL-C (mmol/L) | 2.78 ± 0.89 | 2.77 ± 0.85 | 2.65 ± 0.69 | 2.77 ± 0.79 | 0.792 | 0.499 |
TC (mmol/L) | 4.49 ± 1.13 | 4.64 ± 0.93 | 4.58 ± 0.93 | 4.76 ± 1.08 | 1.363 | 0.253 |
TG (mmol/L) | 1.53 (1.03,2.24) | 1.37 (0.98,2.22) | 1.44 (0.08,1.90) | 1.28 (1.00,1.88) | 3.468 | 0.325 |
ApoA1 (g/L) | 1.26 ± 0.21 | 1.25 ± 0.22 | 1.27 ± 0.33 | 1.32 ± 0.25 | 1.524 | 0.208 |
ApoB (g/L) | 1.08 ± 0.38 | 1.04 ± 0.25 | 1.07 ± 0.29 | 1.11 ± 0.31 | 0.652 | 0.582 |
Lp (a) (g/L) | 14.60 (9.85,27.95) | 16.05 (9.08,31.83) | 13.00 (7.30,26.30) | 16.05 (8.65,30.70) | 2.297 | 0.513 |
Creatinine (mmol/L) | 74.44 ± 28.37 | 71.75 ± 17.51 | 70.08 ± 17.81 | 68.00 ± 20.68 | 1.740 | 0.158 |
Uric acid (mmol/L) | 355.29 ± 86.97 | 334.89 ± 82.80 | 338.52 ± 89.76 | 343.52 ± 84.53 | 0.971 | 0.406 |
Fasting glucose (mmol/L) | 5.49 ± 0.92 | 5.66 ± 1.10 | 5.72 ± 1.29 | 5.73 ± 1.40 | 0.846 | 0.469 |
Temperature | ||||||
Maximum, °C | 19.5 ± 4.7 | 30.9 ± 3.0 | 23.2 ± 3.9 | 10.2 ± 2.3 | 559.118 | < 0.001 |
Minimum, °C | 9.6 ± 4.3 | 23.1 ± 2.9 | 14.0 ± 4.4 | 3.0 ± 1.0 | 546.774 | < 0.001 |
Average temperature °C | 14.0 ± 4.5 | 26.5 ± 2.9 | 18.0 ± 4.2 | 6.1 ± 1.4 | 560.699 | < 0.001 |
Mean precipitation (mm) | 160.7 (70.1,60.7) | 146.7 (43.7,526.9) | 65.8 (10.5,66.3) | 88.4 (23.6,150.3) | 120.572 | < 0.001 |