Differences after stratification for initial vaccine hesitancy score
Analyses stratified by initial VH scores showed a decrease in the control group by 18.5% in the high VH category (p < 0.0001) and by 13.0% in the moderate VH category (p = 0.0002, Figure 2). In the MI group, VH decreased by 33.5% in the high and by 34.5% in the moderate VH categories (p < 0.0001). Participants with already low levels of VH at T0 showed a significant 28.1% decrease after MI (p = 0.0001), but not after control intervention (p = 0.07). The D-I-D effect was significant in the high and moderate VH categories (high baseline score: −9.9 points, p = 0.001; moderate: −8.3 points, p < 0.0001) but not the low VH category (−2.3 points, p = 0.14).Changes in vaccine hesitancy scores by intervention group according to initial vaccine hesitancy category, south-eastern France, November 2021–April 2022 (n = 733)D-I-D: difference-in-difference; MI: motivational interview; VH: vaccine hesitancy.Vaccine hesitancy scores were estimated with 95% confidence intervals in the D-I-D model, at T0 and T1, according to group (MI or control) and initial VH category (low: n = 157 (MI) and 158 (control); moderate: n = 108 (MI) and 121 (control); high: n = 98 (MI) and 91(control)). In the high VH category, for example, VH scores in the MI group decreased by 33.5%, from 62.4% to 41.5% (p < 0.0001).