Table 1. Characteristics of elderly persons with and without influenza vaccination, Taiwan, 2005–2012*.
| Characteristic | With vaccination, n = 64,290 | Without vaccination, n = 35,692 | p value |
|---|---|---|---|
| Age, y, mean ± SD | 73.2 ± 6.3 | 74.6 ± 8.2 | <0.001 |
| 65–69 | 23,339 (36.3) | 12,321 (34.5) | <0.001 |
| 70–74 | 17,848 (27.8) | 7,842 (22.0) | |
|
>75 |
23,103 (35.9) |
15,529 (43.5) |
|
| Sex | |||
| F | 32,426 (50.4) | 18,042 (50.6) | 0.734 |
| M |
31,864 (49.6) |
17,650 (49.4) |
|
| Income level | |||
| Low | 44,867 (69.8) | 25,250 (70.7) | <0.001 |
| Intermediate | 11,353 (17.7) | 5,692 (16.0) | |
| High |
8,070 (12.5) |
4,750 (13.3) |
|
| Urbanization | |||
| Urban | 14,767 (23.0) | 10,245 (28.7) | <0.001 |
| Suburban | 38,331 (59.6) | 20,817 (58.3) | |
| Rural |
11,192 (17.4) |
4,630 (13.0) |
|
| Concurrent conditions | |||
| Diabetes | 14,085 (21.9) | 6,944 (19.5) | <0.001 |
| CHF | 3,200 (5.0) | 2,257 (6.3) | <0.001 |
| COPD | 12,310 (19.2) | 5,881 (16.5) | <0.001 |
| Asthma | 6,491 (10.1) | 2,948 (8.3) | <0.001 |
| CVD | 10,824 (16.8) | 5,938 (16.6) | 0.419 |
| HTN | 36,444 (56.7) | 16,998 (47.6) | <0.001 |
| CKD | 4,790 (7.5) | 2,937 (8.2) | <0.001 |
| Cancer |
4,142 (6.4) |
2,731 (7.7) |
<0.001 |
| Outcomes | |||
| New-onset TB | 741 (1.15) | 400 (1.12) | 0.649 |
| Follow-up years, mean (SD) | 7.9 (2.0) | 6.4 (3.3) | <0.001 |
| Total follow-up duration, person-years | 510,458.1 | 227,910.5 | <0.001 |
*Values are no. (%) persons unless otherwise indicated. CHF, congestive heart failure; CKD, chronic kidney disease; COPD, chronic obstructive pulmonary disease; CVD, cerebrovascular disease; HTN, hypertension; TB, tuberculosis.