| Cases | Controls | Unadjusted | Adjusted |
---|
| N | N | VE, % | 95% CI | VE, % | 95% CI |
---|
All strains | 208 | 271 | 35.8 | 4.5, 56.8 | 33.2a
| −6.7, 58.2 |
Influenza A
| 86 | 110 | 48.5 | 1.4, 73.1 | 42.2b
| −24.2, 73.1 |
A/H1N1 | 55 | 68 | 57.8 | 2.7, 81.7 | 68.7c
| 6.4, 89.5 |
A/H3N2 | 13 | 18 | 38.2 | −599.5, 94.5 | – | – |
Influenza B
| 122 | 161 | 26.2 | −22.2, 55.4 | 25.4d
| −35.4, 58.9 |
B/Victoria | 37 | 48 | 25.6 | −82.8, 69.7 | 9.7e
| −161.6, 68.9 |
B/Yamagata | 53 | 70 | 16.6 | −81.1, 61.6 | 36.9f
| −72.5, 76.9 |
-
N number of patients, CI Confidence Interval, TIV trivalent influenza vaccine, VE vaccine effectiveness
- Covariate (p-value in model):
-
a Influenza vaccination (0.092), age (0.018), anti-viral use before admission (0.881), seniors including patient living in dwelling (0.020), pregnancy (0.045);
-
b Influenza vaccination (0.160), age (0.192), anti-viral use before admission (0.874) seniors including patient living in dwelling (0.188), pregnancy (0.991);
-
c Influenza vaccination (0.038), age (0.173), anti-viral use before admission (0.895) seniors including patient living in dwelling (0.201), pregnancy (0.994);
-
d Influenza vaccination (0.335), age (0.045), seniors including patient living in dwelling (0.046), pregnancy (0.099);
-
e Influenza vaccination (0.850), age (0.054), seniors including patient living in dwelling (0.888), pregnancy (0.996);
-
f Influenza vaccination (0.370), age (0.783), seniors including patient living in dwelling (0.037), pregnancy (0.740)