Table IV.
Patient demographics
| Demographics | All patients (n = 296 76) | No neurologic complications (n = 27 430, 92.4%) | Neurologic complications (n = 2246, 7.6%) | P value |
|---|---|---|---|---|
|
| ||||
| Age, y, median [IQR] | 4 [1, 8] | 4 [1, 8] | 3 [1, 7] | <.001 |
| Flu diagnosis position | ||||
| Primary | 15 406 (51.9) | 14 547 (53) | 859 (38.2) | <.001 |
| Secondary | 14 270 (48.1) | 12 883 (47) | 1387 (61.8) | |
| Age, y | ||||
| <1 | 8960 (30.2) | 8159 (29.7) | 801 (35.7) | <.001 |
| 1–6 | 10 684 (36) | 9862 (36) | 822 (36.6) | |
| 7–11 | 5653 (19) | 5307 (19.3) | 346 (15.4) | |
| 12–17 | 4379 (14.8) | 4102 (15) | 277 (12.3) | |
| Sex | ||||
| Male | 16 627 (56) | 15 307 (55.8) | 1320 (58.8) | .004 |
| Female | 13 041 (43.9) | 12 117 (44.2) | 924 (41.1) | |
| Race | ||||
| Non-Hispanic White | 12 211 (41.1) | 11 332 (41.3) | 879 (39.1) | <.001 |
| Non-Hispanic Black | 7356 (24.8) | 6790 (24.8) | 566 (25.2) | |
| Hispanic | 6453 (21.7) | 5992 (21.8) | 461 (20.5) | |
| Asian | 842 (2.8) | 744 (2.7) | 98 (4.4) | |
| Other | 2814 (9.5) | 2572 (9.4) | 242 (10.8) | |
| Payor | ||||
| Government | 18 336 (61.8) | 16 918 (61.7) | 1418 (63.1) | .040 |
| Private | 9648 (32.5) | 8965 (32.7) | 683 (30.4) | |
| Other | 1692 (5.7) | 1547 (5.6) | 145 (6.5) | |
| Census division | ||||
| East North Central | 5495 (18.5) | 5103 (18.6) | 392 (17.5) | <.001 |
| East South Central | 2500 (8.4) | 2288 (8.3) | 212 (9.4) | |
| Middle Atlantic | 2633 (8.9) | 2438 (8.9) | 195 (8.7) | |
| Mountain | 2407 (8.1) | 2244 (8.2) | 163 (7.3) | |
| New England | 1044 (3.5) | 987 (3.6) | 57 (2.5) | |
| Pacific | 4013 (13.5) | 3692 (13.5) | 321 (14.3) | |
| South Atlantic | 4152 (14) | 3861 (14.1) | 291 (13) | |
| West North Central | 2515 (8.5) | 2273 (8.3) | 242 (10.8) | |
| West South Central | 4917 (16.6) | 4544 (16.6) | 373 (16.6) | |
| Any complex chronic condition | ||||
| No | 18 662 (62.9) | 17 153 (62.5) | 1509 (67.2) | <.001 |
| Yes | 11 014 (37.1) | 10 277 (37.5) | 737 (32.8) | |
| Number of non-neurologic complex chronic conditions | ||||
| 0 | 18 668 (62.9) | 17 158 (62.6) | 1510 (67.2) | <.001 |
| 1 | 6546 (22.1) | 6196 (22.6) | 350 (15.6) | |
| 2–3 | 3894 (13.1) | 3588 (13.1) | 306 (13.6) | |
| >3 | 568 (1.9) | 488 (1.8) | 80 (3.6) | |
| Neurologic complex chronic condition | ||||
| No | 27 258 (91.9) | 25 405 (92.6) | 1853 (82.5) | <.001 |
| Yes | 2418 (8.1) | 2025 (7.4) | 393 (17.5) | |
| ICU | ||||
| No | 24 932 (84) | 23 237 (84.7) | 1695 (75.5) | <.001 |
| Yes | 4744 (16) | 4193 (15.3) | 551 (24.5) | |
| Predominant circulating influenza strain during season* | ||||
| Influenza A H1N1 | 7297 (24.6) | 6725 (24.5) | 572 (25.5) | .602 |
| Influenza A H3N2 | 17 299 (58.3) | 16 004 (58.3) | 1295 (57.7) | |
| Influenza B | 5080 (17.1) | 4701 (17.1) | 379 (16.9) | |
| In-hospital antiviral medication | ||||
| No | 7509 (25.3) | 7029 (25.6) | 480 (21.4) | <.001 |
| Yes | 22 167 (74.7) | 20 401 (74.4) | 1766 (78.6) | |
Column percentages listed in parentheses after each value except where otherwise noted.
*
Influenza strain was extrapolated from each patient’s census division during the week of admission for each encounter, identified by CDC Flu Activity & Surveillance on week of admission.