Table 3 Estimated effect of vaccination on nosocomial influenza under variations of the analysis (sensitivity analyses)
Sensitivity Analyses | Effect of Vaccination on Nosocomial Influenza Rate, Adjusted IRRa |
|---|---|
By different groups of healthcare workers (IRR per 10% increase in vaccine coverage) | |
Overall | 0.93 (0.73–1.18) |
Clinical Healthcare Workers | 0.89 (0.69–1.15) |
Nursing | 0.88 (0.67–1.16) |
By categorization of vaccination rate | |
Clinical Healthcare Workers (IRR per 10% increase in vaccine coverage) | 0.89 (0.69–1.15) |
Clinical Healthcare Workers (IRR of coverage ≥70% vs <70%) | 0.83 (0.50–1.40) |
By time criteria of nosocomial influenza diagnosis (IRR per 10% increase in vaccine coverage) | |
Cut-off of 7 days or more | 0.89 (0.69–1.15) |
Cut-off of 4 days or more | 0.94 (0.79–1.12) |
Cut-off of 3 days or more | 0.96 (0.82–1.13) |
By inclusion of national influenza sentinel surveillance informationb(IRR per 10% increase in vaccine coverage) | |
Without national surveillance information | 0.89 (0.69–1.15) |
With national surveillance information | 0.89 (0.69–1.15) |