Differences after stratification for education level
−2.7
Participants with a low education level (equivalent to or lower than high school) had higher initial VH scores than those with a high education level (post-secondary education), in both the MI (41.2 vs 29.8/100) and the control (39.7 vs 29.4/100) groups. In the MI group, VH decreased by around one third in both education categories (p < 0.0001) (Figure 3), while in the control group, VH decreased by 21.9% among those with a high education level (p = 0.001) but not significantly among those with a low education level (p = 0.07). The D-I-D effect of MI vs the control intervention on VH scores was significant among participants with a low education level (−9.3 points, p = 0.01) but not among those with a high level (−2.7 points, p = 0.31).Changes in vaccine hesitancy scores by intervention group according to education levels, south-eastern France, November 2021–April 2022 (n = 708D-I-D: difference-in-difference; MI: motivational interview; VH: vaccine hesitancy.
Scores for VH were estimated with 95% confidence intervals in the D-I-D model, at T0 and T1, according to group (MI or control) and education level (≤ high school: n = 139 (MI) and 121 (control); post-secondary education: n = 213 (MI) and 235 (control)). Among the participants with less education, for example, VH scores in the MI group decreased by 33.3%, from 41.2% to 27.4% (p < 0.0001).