Geo-map on participation for the high risk individuals in pilot screening study for AF, conducted in the municipality of Halmstad, Sweden; divided into 12 parishes (in total, 491 participants and 217 non-participants among the high risk indivduals). For each parish, a smoothed non-participation ratio (SmNPR) was calculated (range: 0.75–1.51; SmNRP = 1 corresponds to the expected participation based on the total study group). A corresponding statistical certainty map based on the calculated posterior probabilities of a parish-specific NPR above 1 given the data [Pr(NPR>1|data)] is also shown [dark red color, Pr(NPR>1|data) > 0.95, i.e. a parish with data yielding strong statistical evidence of lower participation; light red color, Pr(NPR>1|data) > 0.90, i.e. a parish with data yielding moderate statistical evidence of lower participation].
Engdahl et al. BMC Public Health 2013 13:715 doi:10.1186/1471-2458-13-715