Table 1.
Baseline characteristics of participants aged ≥ 16 years, (significant OR in bold)
| Had H1N1 vaccine | Yes (n = 3716) | No (n = 312) | Total (n = 4028) | P | OR (95% CI) |
|---|---|---|---|---|---|
| Gender (Female) | 2157 (58.7%) | 148 (47.9%) | 2305 (57.9) | P < 0.0001 | 1.55 (1.22, 1.97) |
| 46 | |||||
| Age at consent (years): | |||||
| Mean (SD) | 53.6 (16.9) | 54.4 (17.9) | 53.6 (17.0) | P = 0.8016 | |
| Missing | 32 | ||||
| Caregiver | 247 (7.3) | 18 (6.6) | 265 (7.3) | P = 0.654 | 1.12 (0.68, 1.95) |
| Missing | 384 | ||||
| Healthcare professional | 614 (17.4) | 27 (9.4) | 641 (16.8) | P = 0.001 | 2.03 (1.35, 3.17) |
| Missing | 208 | ||||
| Past history vaccination in prior 3 months** | |||||
| Seasonal flu vaccine | 1998 (53.8) | 134 (43.0) | 2132 (53.0) | P < 0.0001 | 1.55 (1.22,1.97) |
| Travel vaccine | 42 (1.1) | 1 (0.3) | 43 (1.1) | P = 0.181 | 3.56(0.60, 144.12) |
| Other vaccine | 128 (3.4) | 6 (1.9) | 134 (3.3) | P = 0.150 | 1.82 (0.80,5.09) |
| Any one or more vaccinations in prior 3 months | 2068 (55.6) | 137 (43.9) | 2205 (54.8) | P < 0.0001 | 1.60 (1.26, 2.04) |
| Type of concurrent vaccination on same day, if vaccinated**: | |||||
| Seasonal flu | 469 (12.6%) | NA | 469 (12.6%) | NA | NA |
| Other | 17 (0.5%) | 16 (0.5%) | |||
| Medical conditions** | |||||
| Asthma | 886 (23.8) | 83 (26.6) | 969 (24.1) | P = 0.272 | 0.86 (0.66, 1.14) |
| Diabetes | 630 (17.0) | 61 (19.6) | 691 (17.2) | P = 0.242 | 0.84 (0.62, 1.14) |
| Heart disease | 565 (15.2) | 54 (17.3) | 619 (15.4) | P = 0.321 | 0.86 (0.63, 1.19) |
| Kidney disease | 55 (1.5) | 10 (3.2) | 65 (1.6) | P = 0.020 | 0.45 (0.23, 1.00) |
| Liver disease | 42 (1.1) | 6 (1.9) | 48 (1.2) | P = 0.215 | 0.58 (0.24, 1.70) |
| Blood disorder | 77 (2.1) | 6 (1.9) | 83 (2.1) | P = 0.859 | 1.08 (0.47, 3.06) |
| Immunosuppression | 217 (5.9) | 10 (3.2) | 227 (5.6) | P = 0.053 | 1.87 (0.98, 4.00) |
| Other condition | 458 (12.3) | 22 (7.1) | 480 (11.9) | P = 0.006 | 1.85 (1.18, 3.04) |
| One or more reported medical condition of interest† | 2457 (66.1) | 207 (66.4) | 2664 (66.1) | P = 0.930 | 0.99 (0.77, 1.27) |
| Pregnant at consent (n, % of females) | 104 (7.5) | 13 (12.5) | 117 (10.7) | P = 0.065 | 0.57 (0.30, 1.14) |
| Missing (female any age) | 810 | ||||
| Other regular medication | 2966 (81.5%) | 247 (83.2%) | 3213 (81.6) | P = 0.525 | 0.89 (0.64, 1.23) |
| Missing | 91 | ||||
| Had flu since April 2009 | 537 (14.7) | 59 (19.5) | 597 (14.9) | P = 0.024 | 0.71 (0.53, 0.98) |
| Missing | 69 |
Percent given of prognostic variable where response provided.
**
Where only positive response provided, percent given of adult cohort (thus missing assumed ‘No’)’. †excluding pregnancy.