Risk of influenza infection in men and women stratified by influenza vaccination status
| Variables | Men | Women | ||||||
| Vaccinated | Unvaccinated | Vaccinated | Unvaccinated | |||||
| OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | |
| Participation in social activities (no of groups) | ||||||||
| 0 | Reference | Reference | Reference | Reference | ||||
| 1 | 1.02 | (0.76 to 1.37) | 0.94 | (0.58 to 1.53) | 1.14 | (0.86 to 1.50) | 0.95 | (0.54 to 1.67) |
| ≥2 | 1.08 | (0.84 to 1.39) | 1.27 | (0.85 to 1.91) | 1.06 | (0.83 to 1.36) | 2.20 | (1.47 to 3.29) |
| Age, years | ||||||||
| 65–69 | Reference | Reference | Reference | Reference | ||||
| 70–74 | 1.15 | (0.85 to 1.56) | 0.80 | (0.53 to 1.22) | 0.94 | (0.71 to 1.25) | 0.39 | (0.24 to 0.63) |
| 75–79 | 0.94 | (0.68 to 1.30) | 0.98 | (0.61 to 1.58) | 0.84 | (0.62 to 1.14) | 0.54 | (0.32 to 0.91) |
| 80–84 | 0.95 | (0.66 to 1.36) | 0.69 | (0.35 to 1.35) | 0.54 | (0.37 to 0.80) | 0.60 | (0.31 to 1.17) |
| ≥85 | 0.81 | (0.50 to 1.31) | 0.69 | (0.27 to 1.76) | 0.62 | (0.38 to 1.00) | – | |
| Self-rated health | ||||||||
| Good | Reference | Reference | Reference | Reference | ||||
| Not good | 0.98 | (0.74 to 1.29) | 0.80 | (0.49 to 1.31) | 1.49 | (1.15 to 1.92) | 1.80 | (1.12 to 2.87) |
| Missing | 1.54 | (0.92 to 2.59) | 1.41 | (0.60 to 3.29) | 1.59 | (0.98 to 2.59) | 1.06 | (0.38 to 2.93) |
| Any respiratory disease | ||||||||
| No | Reference | Reference | Reference | Reference | ||||
| Yes | 1.94 | (1.40 to 2.71) | 2.44 | (1.28 to 4.68) | 1.89 | (1.31 to 2.73) | 1.14 | (0.45 to 2.87) |
| Living with grandchild | ||||||||
| No | Reference | Reference | Reference | Reference | ||||
| Yes | 1.21 | (0.92 to 1.60) | 1.56 | (0.97 to 2.49) | 0.98 | (0.75 to 1.28) | 0.91 | (0.51 to 1.61) |
| Educational attainment, years | ||||||||
| <6 | Reference | Reference | Reference | Reference | ||||
| 6–9 | 0.87 | (0.37 to 2.04) | 0.38 | (0.11 to 1.29) | 0.90 | (0.43 to 1.89) | 1.30 | (0.17 to 9.76) |
| 10–12 | 0.73 | (0.31 to 1.75) | 0.58 | (0.17 to 1.96) | 0.77 | (0.36 to 1.64) | 1.20 | (0.16 to 9.14) |
| ≥13 | 0.80 | (0.33 to 1.91) | 0.39 | (0.11 to 1.36) | 0.74 | (0.33 to 1.64) | 1.03 | (0.13 to 8.14) |
| Others | 1.20 | (0.28 to 5.11) | 1.07 | (0.17 to 6.86) | 0.75 | (0.15 to 3.68) | 1.86 | (0.11 to 31.34) |
| Missing | 0.84 | (0.23 to 3.14) | 0.26 | (0.03 to 2.57) | 1.09 | (0.39 to 3.01) | 0.57 | (0.03 to 9.36) |
| Equivalent income, million yen | ||||||||
| <1.99 | Reference | Reference | Reference | Reference | ||||
| 2–3.99 | 0.87 | (0.68 to 1.12) | 0.87 | (0.58 to 1.31) | 1.09 | (0.84 to 1.41) | 1.09 | (0.72 to 1.67) |
| >4 | 0.67 | (0.43 to 1.03) | 1.17 | (0.65 to 2.11) | 0.79 | (0.50 to 1.25) | 0.58 | (0.25 to 1.39) |
| Missing | 0.66 | (0.84 to 1.62) | 0.66 | (0.39 to 1.12) | 0.94 | (0.71 to 1.24) | 0.62 | (0.37 to 1.03) |