Table 1.
Clinical characteristics between initially asymptomatic and symptomatic patients with COVID-19.
| Total (n = 5621) N (%) |
Initially asymptomatic patients (n = 1449) N (%) |
Initially symptomatic patients (n = 4172) N (%) |
p Value | |
|---|---|---|---|---|
| Age group, years | <.001 | |||
| <10 | 66 (1.2) | 32 (2.2) | 34 (0.8) | |
| 10–19 | 206 (3.7) | 73 (5.0) | 133 (3.2) | |
| 20–29 | 1119 (19.9) | 329 (22.7) | 790 (18.9) | |
| 30–39 | 564 (10.0) | 147 (10.1) | 417 (10.0) | |
| 40–49 | 742 (13.2) | 167 (11.5) | 575 (13.8) | |
| 50–59 | 1145 (20.4) | 253 (17.5) | 892 (21.4) | |
| 60–69 | 914 (16.3) | 194 (13.4) | 720 (17.3) | |
| 70–79 | 542 (9.6) | 135 (9.3) | 407 (9.8) | |
| ≥80 | 323 (5.7) | 119 (8.2) | 204 (4.9) | |
| Male sex | 2317 (41.2) | 701 (48.4) | 1616 (38.7) | <.001 |
| Body mass index, kg/m2 | .03 | |||
| <18.5 | 260/4426 (5.9) | 79/1092 (7.2) | 181/3334 (5.4) | |
| ≥18.5 | 4166/4426 (94.1) | 1013/1092 (92.8) | 3153/3334 (94.6) | |
| Systolic blood pressure, mmHg | .42 | |||
| <120 | 1317/5486 (24.0) | 347/1397 (24.8) | 970/4089 (23.7) | |
| ≥120 | 4169/5486 (76.0) | 1050/1397 (75.2) | 3119/4089 (76.3) | |
| Diastolic blood pressure, mmHg | .51 | |||
| <80 | 2113/5486 (38.5) | 549/1397 (39.3) | 1564/4089 (38.2) | |
| ≥80 | 3373/5486 (61.5) | 848/1397 (60.7) | 2525/4089 (61.8) | |
| Heart rate, beats/min | 85.8 ± 15.1 | 84.4 ± 14.4 | 86.3 ± 15.3 | <.001 |
| Body temperature, °C | 36.9 ± 0.6 | 36.7 ± 0.4 | 37.0 ± 0.6 | <.001 |
| Charlson comorbidity index score | <.001 | |||
| 0 | 1864 (33.2) | 561 (38.7) | 1303 (31.2) | |
| 1–2 | 1692 (30.1) | 378 (26.1) | 1314 (31.5) | |
| 3–4 | 1350 (24.0) | 290 (20.0) | 1060 (25.4) | |
| ≥5 | 715 (12.7) | 220 (15.2) | 495 (11.9) | |
| Comorbidities | ||||
| Diabetes | 689 (12.3) | 178 (12.3) | 511 (12.2) | >.99 |
| Hypertension | 1199 (21.3) | 289 (19.9) | 910 (21.8) | .15 |
| Congestive heart failure | 58 (1.0) | 19 (1.3) | 39 (0.9) | .28 |
| Chronic heart disease | 179 (3.2) | 42 (2.9) | 137 (3.3) | .53 |
| Asthma | 128 (2.3) | 20 (1.4) | 108 (2.6) | .01 |
| Chronic obstructive pulmonary disease | 40 (0.7) | 10 (0.7) | 30 (0.7) | >.99 |
| Chronic kidney disease | 55 (1.0) | 18 (1.2) | 37 (0.9) | .30 |
| Malignancy | 143 (2.5) | 37 (2.6) | 106 (2.5) | >.99 |
| Chronic liver disease | 82 (1.5) | 22 (1.5) | 60 (1.4) | .93 |
| Connective tissue disease | 38 (0.7) | 6 (0.4) | 32 (0.8) | .22 |
| Dementia | 224 (4.0) | 112 (7.7) | 112 (2.7) | <.001 |
| Laboratory finding | ||||
| Lymphocyte count, ×109/ L | 1.69 ± 1.05 | 1.82 ± 0.92 | 1.65 ± 1.09 | <.001 |
| Haemoglobin, g/L | 133 ± 18 | 133 ± 18 | 133 ± 17 | .80 |
| Platelet counts, ×109/ L | 236.9 ± 82.9 | 245.6 ± 85.1 | 234.0 ± 81.9 | <.001 |
COVID-19: coronavirus disease 2019.