Table 3.
Unadjusted and adjusted logistic regression analyses of factors of booster vaccination acceptance.
| Factors | Unadjusted Logistic Model | Adjusted Logistic Model † | ||
|---|---|---|---|---|
| Crude OR | 95% CI | Adjusted OR (aOR) | 95% CI | |
| Received COVID-19 vaccination (yes vs. no) | 3.90 * | (2.77, 5.50) | 3.05 * | (2.05, 4.54) |
| Perceived susceptibility | ||||
| High risk of COVID-19 infection (yes vs. no) | 1.14 | (0.62, 2.10) | 1.00 | (0.48, 2.08) |
| Variants have higher risk of infection than the existing strains (yes vs. no) | 2.43 * | (1.65, 3.58) | 1.03 | (0.59, 1.80) |
| Perceived severity | ||||
| High severity of COVID-19 infection (yes vs. no) | 1.43 * | (1.02, 2.02) | 0.93 | (0.60, 1.43) |
| Variants can cause more severe illness than the existing strains (yes vs. no) | 2.42 * | (1.67, 3.49) | 1.14 | (0.67, 1.96) |
| Perceived benefits | ||||
| High efficacy of boosters against early circulating strains (yes vs. no) | 4.46 * | (3.11, 6.41) | 1.86 * | (1.11, 3.13) |
| High efficacy of boosters to extend protection (yes vs. no) | 3.57 * | (2.50, 5.09) | 1.64 * | (1.04, 2.61) |
| High efficacy of boosters against variants (yes vs. no) | 3.69 * | (2.63, 5.17) | 1.30 | (0.81, 2.10) |
| Perceived barriers | ||||
| Low safety of boosters (yes vs. no) | 0.13 * | (0.09, 0.19) | 0.21 * | (0.13, 0.35) |
| Worry about serious adverse reaction after vaccination (yes vs. no) | 0.41 * | (0.29, 0.59) | 0.63 * | (0.41, 0.97) |
| Self-efficacy | ||||
| It is easy to get the COVID-19 vaccine if wanted (yes vs. no) | 2.37 * | (1.69, 3.32) | 1.24 | (0.79, 1.93) |
| Cues to action | ||||
| Used to have confirmed or suspected cases in daily close contacts (yes vs. no) | 1.46 | (0.65, 3.26) | 2.77 | (0.98, 7.82) |
| Know about at least one foreign variant (yes vs. no) | 1.85 * | (1.23, 2.78) | 1.20 | (0.70, 2.06) |
| Sociodemographics | ||||
| Age group, years (vs. 18–30) | ||||
| 31–40 | 0.98 | (0.64, 1.50) | 0.91 | (0.51, 1.60) |
| 41–50 | 0.57 * | (0.37, 0.86) | 0.52 * | (0.29, 0.91) |
| 51–59 | 0.80 | (0.44, 1.47) | 0.97 | (0.46, 2.04) |
| Female (vs. male) | 0.75 | (0.54, 1.04) | 0.76 | (0.52, 1.10) |
| Married (vs. never married/divorced/widowed) | 1.20 | (0.82, 1.77) | 1.01 | (0.58, 1.75) |
| College/associate/bachelor’s degree or above (vs. senior high school/technical school or below) | 0.80 | (0.55, 1.17) | 0.49 * | (0.30, 0.81) |
| Employed (vs. retired/out of work/still a student) | 2.16 * | (1.43, 3.27) | 1.84 * | (1.06, 3.20) |
| Household annual income (vs. ≤100,000 CNY) | ||||
| 100,001–200,000 CNY | 1.05 | (0.72, 1.52) | 0.92 | (0.58, 1.45) |
| >200,000 CNY | 1.16 | (0.74, 1.82) | 1.16 | (0.64, 2.09) |
| Residing in urban areas (vs. rural) | 0.87 | (0.51, 1.47) | 0.81 | (0.42, 1.55) |
| Region (vs. eastern) | ||||
| Central | 1.39 | (0.90, 2.14) | 1.26 | (0.76, 2.10) |
| Western | 1.31 | (0.79, 2.18) | 1.71 | (0.96, 3.06) |
| Self-reported health status (good vs. fair/poor) | 1.84 * | (1.31, 2.57) | 0.80 | (0.53, 1.23) |
| Having any chronic disease (yes vs. no) | 0.59 * | (0.38, 0.91) | 0.60 | (0.33, 1.06) |
| Belonging to priority groups for vaccination (yes vs. no) | 2.02 * | (1.27, 3.20) | 1.98 * | (1.13, 3.46) |
Notes: * p < 0.05. OR: odds ratio. CI: confidence interval. CNY: Chinese Yuan, 1 CNY = 0.1543 USD on 25 July 2021. † Goodness of fit: Pearson chi-square = 1030.26, Prob > chi2 = 0.2261.