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Table 2 Odds ratios (OR) of influenza onset versus vaccination and other characteristics in Japanese subjects: multivariate logistic regression

From: Influenza vaccination effectiveness for people aged under 65 years in Japan, 2013/2014 season: application of a doubly robust method to a large-scale, real-world dataset

Variable OR (95% CI) P value
2013/2014 season vaccination 0.756 (0.738–0.776) < 0.001
2012/2013 season vaccination 1.051 (1.024–1.079) < 0.001
Insured persons (vs. dependents) 1.009 (0.965–1.056) 0.685
Female (vs. Male) 0.960 (0.940–0.980) < 0.001
Number of children aged 0 to 15 years in a family a 1.114 (1.100–1.128) < 0.001
Before influenza season
 High-risk condition 1.138 (1.110–1.167) < 0.001
Number of outpatient visits
 During office hours (per visit) 1.016 (1.014–1.018) < 0.001
 Outside office hours (per visit) 1.000 (0.987–1.013) 0.980
 Emergency hospitalization 0.897 (0.658–1.224) 0.493
During influenza season
 Preceding onset of influenza in family members 1.263 (1.234–1.294) < 0.001
  1. Influenza onset was classified using the ICD-10 J10, J11 codes for clinical influenza. Age effects were modeled using linear tail-restricted cubic spline functions with 5 knots based on percentiles
  2. a Number of other dependents aged 0 to 15 years covered by the same insurance number