Table 2.
Determinants | Comparison made | Number of studies | Total population size | POR [95% CI] | I2 statistic (%) |
---|---|---|---|---|---|
Age | By one-year increment in age | 2 | 134,841 | 1.01 [1.00, 1.03] | 28.7 |
Older age compared with younger age | 2 | Unclear | 1.44 [1.11, 1.86] | 26.4 | |
Ethnicity | African Americans compared with Whites | 4 | Unclear | 0.60 [0.49, 0.73] | 37.6 |
Hispanics compared with Whites | 2 | 13,116,887 | 0.69 [0.53, 0.89] | 63.6 | |
Asians compared with Whites | 2 | 13,116,887 | 1.01 [0.50, 2.05] | 80.6 | |
Ethnic minorities compared with Whites | 5 | Unclear | 0.75 [0.61, 0.91] | 86.1 | |
Income | Low compared with high income | 2 | 13,106,163 | 0.94 [0.92, 0.96] | 0 |
Marital status | Married compared with not married | 2 | 13,240,264 | 1.10 [0.89, 1.37] | 0 |
Education | Higher compared with lower education | 3 | 13,240,264 | 1.28 [0.97, 1.68] | 74.4 |
Comorbidity | Comorbidity compared with no comorbidity | 2 | Unclear | 1.31 [0.75, 2.30] | 71.6 |
Health care insurance | Health insurance compared with no insurance | 4 | 13,285,379 | 1.40 [1.25, 1.55] | 0.1 |
Note. SIV = seasonal influenza vaccine; POR = pooled odds ratio; CI = confidence interval; Unclear = one study population size was not reported.
Note: Bold values shows statistically significant results.