Table 1.
Patient Demographics and Demographic Differences Between Clusters
| Characteristic | Total | Cluster 1 | Cluster 2 | Cluster 3 | P Valuea |
|---|---|---|---|---|---|
| (N = 233) | (n = 37) | (n = 87) | (n = 108) | ||
| Age, y, median (IQR) | 43 (36–54) | 47 (40–55) | 42 (35–52) | 44 (32–55) | .48 |
| Female sex | 173 (74) | 32 (86.5) | 70 (80.4) | 70 (64.8) | <.01 |
| White ethnicity | 184 (80) | 28 (83.9) | 73 (77.8) | 83 (79) | .62 |
| BMI kg/m2, median (IQR) | 27.41 (23.75–32.28) | 29.5 (25.1–33.7) | 27.7 (23.6–33.1) | 26.5 (23.5–30.2) | .09 |
| Mild diseaseb | 180 (77.3) | 29 (78) | 76 (87) | 75 (69) | .07 |
| Hospitalized during initial COVID-19 illness | 75 (32) | 26 (70.3) | 65 (74.7) | 67 (62) | .16 |
| Admitted to ICU | 12 (5) | 2 (1) | 2 (1) | 8 (3) | .28 |
| Time from onset of acute COVID-19 symptoms, wk, median (IQR) | 18 (10–29) | 22.7 (10–37.9) | 19.9 (13–27.8) | 15.5 (9–27.2) | .01 |
| Healthcare worker | 155 (66) | 31 (83.8) | 63 (72) | 60 (55) | .002 |
| Length of work absence, wk, median (IQR) | 7 (4–15) | 10 (7.5–24) | 12 (6–24) | 6 (2–12) | <.01 |
| MRC score, median (IQR) | 2 (1–3) | 2 (2–3) | 3 (2–3) | 1 (1–2) | <.01 |
| ED attendance, No. (%) of patients attending | 86 (37) | 15 (45) | 43 (49) | 28 (26) | <.01 |
Data are presented as No. (%) unless otherwise specified.
Abbreviations: BMI, body mass index; COVID-19, coronavirus disease 2019; ED, emergency department; ICU, intensive care unit; IQR, interquartile range; MRC, Medical Research Council.
P value refers to differences between clusters by χ2 or Kruskal-Wallis test for qualitative and quantitative data, respectively.
Graded by World Health Organization severity [12].