Variable | No. (%) of patients* | No. (%) of patients* | ||||
---|---|---|---|---|---|---|
Historical control Jan. 1–Mar. 11, 2019 n = 7981 | Pre-COVID-19 Jan. 1–Mar. 10, 2020 n = 7969 | Standardized difference†, % | Historical control Mar. 12–July 1, 2019 n = 13 048 | COVID-19 Mar. 11–June 30, 2020 n = 10 693 | Standardized difference†, % | |
Sex, female | 5695 (71.4) | 5597 (70.2) | 2 | 9073 (69.5) | 7271 (68.0) | 3 |
Age, yr, median (IQR) | 34 (27–47) | 34 (27–47) | 1 | 35 (27–49) | 35 (27–51) | 4 |
Comorbidities | ||||||
Hypertension | 1235 (15.5) | 1198 (15.0) | 1 | 2192 (16.8) | 1724 (16.1) | 2 |
Diabetes | 675 (8.5) | 644 (8.1) | 1 | 1119 (8.6) | 889 (8.3) | 1 |
Congestive heart failure | 188 (2.4) | 155 (1.9) | 3 | 266 (2.0) | 176 (1.6) | 3 |
COPD | 378 (4.7) | 385 (4.8) | 0 | 669 (5.1) | 512 (4.8) | 2 |
Rheumatoid arthritis | 60 (0.8) | 58 (0.7) | 0 | 119 (0.9) | 102 (1.0) | 0 |
History of MI | 85 (1.1) | 77 (1.0) | 1 | 153 (1.2) | 114 (1.1) | 1 |
Income quintile | ||||||
1 (lowest) | 1765 (22.1) | 1805 (22.7) | 1 | 2711 (20.8) | 2225 (20.8) | 0 |
2 | 1634 (20.5) | 1673 (21.0) | 1 | 2710 (20.8) | 2239 (20.9) | 0 |
3 | 1656 (20.7) | 1641 (20.6) | 0 | 2602 (19.9) | 2202 (20.6) | 2 |
4 | 1517 (19.0) | 1472 (18.5) | 1 | 2673 (20.5) | 2039 (19.1) | 4 |
5 (highest) | 1376 (17.2) | 1345 (16.9) | 1 | 2315 (17.7) | 1944 (18.2) | 1 |
Missing | 33 (0.4) | 33 (0.4) | 0 | 37 (0.3) | 44 (0.4) | 2 |
Rurality | ||||||
Urban | 7005 (87.8) | 6998 (87.8) | 0 | 11 477 (88.0) | 9363 (87.6) | 1 |
Rural | 945 (11.8) | 941 (11.8) | 0 | 1537 (11.8) | 1291 (12.1) | 1 |
Missing | 31 (0.4) | 30 (0.4) | 0 | 34 (0.3) | 39 (0.4) | 2 |
Time of presentation | ||||||
After hours | 2225 (27.9) | 2176 (27.3) | 1 | 3704 (28.4) | 3037 (28.4) | 0 |
Weekend | 2258 (28.3) | 2256 (28.3) | 0 | 3664 (28.1) | 2939 (27.5) | 1 |
Diagnosis | ||||||
Appendicitis | 3009 (37.7) | 3140 (39.4) | 3 | 5451 (41.8) | 4364 (40.8) | 2 |
Cholecystitis | 1688 (21.2) | 1607 (20.2) | 2 | 2666 (20.4) | 2496 (23.3) | 7 |
Ectopic pregnancy | 531 (6.7) | 490 (6.1) | 2 | 815 (6.2) | 701 (6.6) | 1 |
Miscarriage | 2753 (34.5) | 2732 (34.3) | 0 | 4116 (31.5) | 3132 (29.3) | 5 |