Table 1.
Baseline characteristics of the patients diagnosed with COVID-19 in different data sets. P values were estimated using the Student 2-tailed t test or the Mann-Whitney U test for continuous variables and the Pearson chi-square test or Fisher exact test for categorical variables.
| Characteristics | Total (n=1206) | Boramae Medical Center (n=739) | Korean Imaging Cohort of COVID-19 (n=467) | P value | ||||
| Age, mean (SD) | 53.4 (18.4) | 54.5 (17.6) | 51.8 (19.4) | .01 | ||||
| Female, n (%) | 631 (52.3) | 376 (50.9) | 255 (54.6) | .23 | ||||
| Every-day smoker, n (%) | 113 (9.4) | 84 (11.3) | 29 (6.2) | .004 | ||||
| Comorbidities, n (%) | ||||||||
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Hypertension | 317 (26.3) | 213 (28.8) | 104 (22.3) | .01 | |||
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Diabetes mellitus | 188 (15.6) | 118 (16.0) | 70 (15) | .71 | |||
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Cancer | 74 (6.1) | 51 (6.9) | 23 (4.9) | .20 | |||
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Cardiovascular disease | 73 (6.1) | 50 (6.8) | 23 (4.9) | .24 | |||
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Chronic lung disease | 50 (4.1) | 38 (5.1) | 12 (2.6) | .04 | |||
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Chronic liver disease | 26 (2.2) | 24 (3.2) | 2 (0.4) | .002 | |||
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Chronic kidney disease | 20 (1.7) | 13 (1.8) | 7 (1.5) | .91 | |||