The effect of influenza vaccine on asthma: outcomes adjusted
| Independent variables | Odds of a clinic visit | Odds of an ED visit | Odds of hospitalisation | |||
|---|---|---|---|---|---|---|
| OR (95% CI) | p value | OR (95% CI) | p value | OR (95% CI) | p value | |
| All independent variables listed are included in the logistic regression model. | ||||||
| Study group | ||||||
| Received vaccine v not | 2.9 (2.0 to 4.1) | <0.001 | 2.0 (1.2 to 3.1) | 0.01 | 1.9 (0.9 to 3.9) | 0.10 |
| Asthma severity | ||||||
| Severe v mild | 3.7 (2.5 to 5.5) | <0.001 | 2.0 (1.3 to 3.1) | 0.002 | 2.5 (1.3 to 4.8) | 0.01 |
| Insurance | ||||||
| Non-private v private | 1.6 (1.1 to 2.5) | 0.03 | 0.8 (0.5 to 1.5) | 0.52 | 1.5 (0.6 to 3.8) | 0.40 |
| Outpatient clinic utilisation | ||||||
| High v low | 2.5 (1.8 to 3.6) | <0.001 | 1.1 (0.7 to 1.7) | 0.59 | 2.0 (1.01 to 4.0) | 0.047 |
| Race | ||||||
| Black v white | 1.5 (0.9 to 2.4) | 0.06 | 1.6 (0.9 to 2.7) | 0.12 | 1.2 (0.5 to 2.7) | 0.63 |
| Hispanic v white | 1.4 (0.9 to 2.2) | 0.18 | 1.1 (0.6 to 2.0) | 0.82 | 1.2 (0.5 to 2.9) | 0.68 |
| Age | ||||||
| ⩽5 years v >5 years | 0.7 (0.5 to 0.9) | 0.04 | 1.0 (0.6 to 1.5) | 0.93 | 0.7 (0.4 to 1.4) | 0.31 |
| Sex | ||||||
| Male v female | 1.2 (0.9 to 1.7) | 0.25 | 1.3 (0.8 to 2.0) | 0.25 | 1.5 (0.8 to 2.9) | 0.19 |
| Smoke-free home | ||||||
| No v yes | 1.0 (0.6 to 1.4) | 0.81 | 1.2 (0.7 to 2.0) | 0.50 | 0.9 (0.4 to 1.9) | 0.74 |
| Unknown v yes | 0.9 (0.6 to 1.3) | 0.55 | 1.1 (0.7 to 1.9) | 0.67 | 2.0 (0.9 to 4.2) | 0.08 |
| Influenza vaccine previous season | ||||||
| No v yes | 0.7 (0.5 to 1.1) | 0.06 | 1.0 (0.6 to 1.6) | 0.96 | 1.1 (0.6 to 2.0) | 0.85 |