Table 1 Baseline demographic and clinical characteristics by hospitalization status
From: Burden of influenza hospitalization among high-risk groups in the United States
Baseline characteristics | Patients with ≥1 influenza-related hospitalization N = 18,509 | Patients without influenza-related hospitalization N = 1,582,858 | p-value |
|---|---|---|---|
Age, mean ± SD | 47.3 ± 23.1 | 28.8 ± 19.8 | < 0.0001 |
Age group, n (%) | < 0.0001 | ||
0–4 | 1201 (6.5) | 125,906 (8.0) | |
5–17 | 1807 (9.8) | 512,517 (32.4) | |
18–49 | 4926 (26.6) | 623,281 (39.4) | |
50–64 | 6787 (36.7) | 284,492 (18.0) | |
65+ | 3788 (20.5) | 36,662 (2.3) | |
Sex, n (%) | 0.71 | ||
Male | 8749 (47.3) | 745,993 (47.1) | |
Female | 9760 (52.7) | 836,865 (52.0) | |
Payer type, n (%) | < 0.0001 | ||
Commercial | 9374 (50.7) | 866,656 (54.8) | |
Self-insured | 6426 (34.7) | 599,540 (37.9) | |
Medicaid | 1769 (9.6) | 108,617 (6.9) | |
Medicare risk | 852 (4.6) | 2509 (0.2) | |
Other/Unknown | 88 (0.5) | 5536 (0.3) | |
Geographic region, n (%) | < 0.0001 | ||
Northeast | 3457 (18.7) | 188,490 (11.9) | |
Midwest | 4758 (25.7) | 334,387 (21.1) | |
South | 7583 (41.0) | 906,543 (57.3) | |
West | 2711 (14.7) | 153,438 (9.7) | |
AHRQ/CDC comorbiditiesa, mean ± SD | 3.8 ± 3.5 | 1.0 ± 1.6 | < 0.0001 |
AHRQ/CDC comorbidities categorya, n (%) | < 0.0001 | ||
0 | 3510 (19.0) | 891,422 (56.3) | |
1–3 | 6924 (37.4) | 569,667 (36.0) | |
4–6 | 4456 (24.1) | 102,322 (6.5) | |
7–9 | 2221 (12.0) | 15,774 (1.0) | |
10+ | 1396 (7.5) | 3421 (0.2) | |
Index influenza season, n (%) | < 0.0001 | ||
2014 | 4725 (25.5) | 444,002 (28.1) | |
2015 | 3533 (19.1) | 230,985 (14.6) | |
2016 | 4373 (23.6) | 379,894 (24.0) | |
2017 | 5878 (31.8) | 527,977 (33.4) | |
Evidence of influenza vaccination before influenza diagnosis in the index seasona, n (%) | 3954 (21.4) | 280,898 (17.7) | < 0.0001 |