Table 1

Characteristics of inpatients with COVID-19 admitted between March 2020 and February 2021, by COVID-19 hospital prevalence

CharacteristicOverall,
N=38 104
Low prevalence (<10%)
N=9027
Mid prevalence
(10%–25%) N=20 265
High prevalence (>25%)
N=8812
P value*
Month admitted<0.001
 Mar–Apr4589 (12%)1214 (13%)1020 (5.0%)2355 (27%)
 May–Jun2742 (7.2%)1767 (20%)744 (3.7%)231 (2.6%)
 Jul–Aug5403 (14%)1867 (21%)2603 (13%)933 (11%)
 Sep–Oct4733 (12%)2394 (27%)2242 (11%)97 (1.1%)
 Nov–Dec12 373 (32%)487 (5.4%)8559 (42%)3327 (38%)
 Jan–Feb8264 (22%)1298 (14%)5097 (25%)1869 (21%)
Race<0.001
 White26 692 (70%)6074 (67%)14 624 (72%)5994 (68%)
 Black or African American8941 (23%)2187 (24%)4451 (22%)2303 (26%)
 Other2471 (6.5%)766 (8.5%)1190 (5.9%)515 (5.8%)
Age<0.001
 18–497167 (19%)2067 (23%)3659 (18%)1441 (16%)
 50–649758 (26%)2308 (26%)5197 (26%)2253 (26%)
 65–8416 668 (44%)3738 (41%)8981 (44%)3949 (45%)
 85+4511 (12%)914 (10%)2428 (12%)1169 (13%)
Age (median, IQR)67 (54–78)65 (51–76)67 (55–78)68 (56–78)<0.001
Sex0.002
 Female18 834 (49%)4609 (51%)9894 (49%)4331 (49%)
 Male19 270 (51%)4418 (49%)10 371 (51%)4481 (51%)
Insurance<0.001
 Commercial11 588 (30%)2775 (31%)6230 (31%)2583 (29%)
 Medicaid3396 (8.9%)1080 (12%)1658 (8.2%)658 (7.5%)
 Medicare21 692 (57%)4842 (54%)11 644 (57%)5206 (59%)
 Other1428 (3.7%)330 (3.7%)733 (3.6%)365 (4.1%)
Comorbidity
 Obesity13 200 (35%)3199 (35%)6795 (34%)3206 (36%)<0.001
 Asthma3121 (8.2%)799 (8.9%)1627 (8.0%)695 (7.9%)0.030
 Chronic obstructive pulmonary disease5565 (15%)1378 (15%)2947 (15%)1240 (14%)0.073
 Diabetes15 947 (42%)3597 (40%)8632 (43%)3718 (42%)<0.001
 Hypertension16 142 (42%)3663 (41%)8598 (42%)3881 (44%)<0.001
 Heart failure6956 (18%)1738 (19%)3723 (18%)1495 (17%)<0.001
 Chronic ischaemic heart disease8462 (22%)2018 (22%)4541 (22%)1903 (22%)0.3
 Chronic kidney disease8540 (22%)1960 (22%)4631 (23%)1949 (22%)0.073
 Liver disease2263 (5.9%)566 (6.3%)1241 (6.1%)456 (5.2%)0.002
 Neoplasms2467 (6.5%)606 (6.7%)1395 (6.9%)466 (5.3%)<0.001
 Transplant244 (0.6%)67 (0.7%)143 (0.7%)34 (0.4%)0.003
Elixhauser Comorbidity Index9 (0–17)8 (0–17)9 (0–17)9 (0–17)0.15
Social Vulnerability Index<0.001
 Low5417 (14%)1225 (13%)2587 (13%)1605 (18%)
 Mid-low11 905 (31%)2541 (28%)6192 (31%)3172 (36%)
 Mid-high12 602 (33%)3518 (39%)7359 (36%)1725 (20%)
 High8180 (21%)1743 (19%)4127 (20%)2310 (26%)
Vital signs at admission
 Respiratory rate ≥24 breaths/min8055 (21%)1708 (19%)4212 (21%)2135 (24%)<0.001
 Oxygen saturation <94%12 734 (33%)2537 (28%)6990 (34%)3207 (36%)<0.001
 Temperature ≥38°C5086 (13%)1270 (14%)2593 (13%)1223 (14%)0.003
Intensive care unit stay16 756 (44%)4092 (45%)8909 (44%)3755 (43%)<0.001
Mortality5009 (13%)994 (11%)2713 (13%)1302 (15%)<0.001
  • 2 test of independence for categorical variables and Kruskal-Wallis tests for continuous variables.