Fig. 3From: Using cluster analysis to reconstruct dengue exposure patterns from cross-sectional serological studies in SingaporeAge distribution of the samples collected in the 2009 and 2013 serosurveys by cluster. Age was classified as belonging to one of the following age-groups: 16–20; 21–25; 26–30; 31–35; 36–40; 41–45; 46–50; 51–55; 56–60 yearsBack to article page