Figure 1.

Distribution of Self-Report Habit Index (SRHI) scores. This figure shows the distribution of SRHI scores of different subgroups in indoor space and public transport. The horizontal axis represents the different subgroups, and the vertical axis represents the SRHI score. The SRHI score represents the strength of the habit of mask wearing, ranging from 12 to 84. Higher SRHI scores indicate stronger habits. (A) Distribution of SRHI scores of all participants in indoor space and on public transport; (B,C) Distribution of the SRHI scores by sex in indoor space and on public transport; (D,E) Distribution of SRHI scores by age group in indoor space and on public transport. The box plot ranges from lower to upper quartiles, and the middle line represents the median value. Whiskers extend to minimum and maximum scores.