Fig. 3From: Patterns of human social contact and mask wearing in high-risk groups in ChinaDistribution of individual contact patterns. A1–A3 The proportions of contact durations according to individual contact settings (A1), relationships (A2) or frequencies (A3). B1–B3 The proportions of contact frequencies according to individual contact settings (B1), relationships (B2) or contact durations (B3)Back to article page