Table 1.
Characteristics of surgical patients with and without influenza (after matching).
| No influenza (N = 10,272) | Influenza 15–30 days (N = 10,272) | Influenza 1–14 days (N = 10,272) | Value of p | |
|---|---|---|---|---|
| Sex | n (%) | n (%) | 1.0000 | |
| Female | 6,281 (61.2) | 6,281 (61.2) | 6,281 (61.2) | |
| Male | 3,991 (38.8) | 3,991 (38.8) | 3,991 (38.8) | |
| Age, years | 1.0000 | |||
| 18–29 | 1,553 (15.1) | 1,553 (15.1) | 1,553 (15.1) | |
| 30–39 | 2,161 (21.0) | 2,161 (21.0) | 2,161 (21.0) | |
| 40–49 | 1,538 (15.0) | 1,538 (15.0) | 1,538 (15.0) | |
| 50–59 | 1,796 (17.5) | 1,796 (17.5) | 1796 (17.5) | |
| 60–69 | 1,468 (14.3) | 1,468 (14.3) | 1,468 (14.3) | |
| 70–79 | 1,248 (12.2) | 1,248 (12.2) | 1,248 (12.2) | |
| ≥80 | 508 (5.0) | 508 (5.0) | 508 (5.0) | |
| Low income | 139 (1.3) | 139 (1.3) | 139 (1.3) | 1.0000 |
| Types of surgery | 1.0000 | |||
| Skin | 107 (1.0) | 107 (1.0) | 107 (1.0) | |
| Breast | 142 (1.4) | 142 (1.4) | 142 (1.4) | |
| Musculoskeletal | 2,427 (23.6) | 2,427 (23.6) | 2,427 (23.6) | |
| Respiratory | 524 (5.1) | 524 (5.1) | 524 (5.1) | |
| Cardiovascular | 172 (1.7) | 172 (1.7) | 172 (1.7) | |
| Digestive | 2,161 (21.0) | 2,161 (21.0) | 2,161 (21.0) | |
| Kidney, ureter, bladder | 718 (7.0) | 718 (7.0) | 718 (7.0) | |
| Delivery, CS, abortion | 1,686 (16.4) | 1,686 (16.4) | 1,686 (16.4) | |
| Neurosurgery | 865 (8.4) | 865 (8.4) | 865 (8.4) | |
| Eye | 71 (0.7) | 71 (0.7) | 71 (0.7) | |
| Others | 1,399 (13.6) | 1,399 (13.6) | 1,399 (13.6) | |
| Types of anesthesia | 1.0000 | |||
| General | 6,809 (66.3) | 6,809 (66.3) | 6,809 (66.3) | |
| Regional | 3,463 (33.7) | 3,463 (33.7) | 3,463 (33.7) | |
| Medical conditions | ||||
| Hypertension | 2,052 (20.0) | 2052 (20.0) | 2052 (20.0) | 1.0000 |
| Mental disorders | 1,449 (14.1) | 1,449 (14.1) | 1,449 (14.1) | 1.0000 |
| Diabetes | 941 (9.2) | 941 (9.2) | 941 (9.2) | 1.0000 |
| Ischemic heart disease | 463 (4.5) | 463 (4.5) | 463 (4.5) | 1.0000 |
| COPD | 370 (3.6) | 370 (3.6) | 370 (3.6) | 1.0000 |
| Hyperlipidemia | 271 (2.6) | 271 (2.6) | 271 (2.6) | 1.0000 |
| Liver cirrhosis | 100 (1.0) | 100 (1.0) | 100 (1.0) | 1.0000 |
| Heart failure | 92 (0.9) | 92 (0.9) | 92 (0.9) | 1.0000 |
| Renal dialysis | 37 (0.4) | 37 (0.4) | 37 (0.4) | 1.0000 |
| Level of surgical risk | 1.0000 | |||
| Low risk | 5,620 (54.7) | 5,620 (54.7) | 5,620 (54.7) | |
| Medium risk | 4,160 (40.5) | 4,160 (40.5) | 4,160 (40.5) | |
| High risk | 138 (1.3) | 138 (1.3) | 138 (1.3) | |
| Heart surgery | 77 (0.8) | 77 (0.8) | 77 (0.8) | |
| Other | 277 (2.7) | 277 (2.7) | 277 (2.7) |
COPD, chronic obstructive pulmonary disease; CS, cesarean section.