Fig. 5

Analysis of the time since arrival of the pulmonary cases with whom cases notified during 2009–11 were clustered retrospectively. a Proportions of cases with different time since arrival (TSA) who were retrospectively clustered with pulmonary cases with other times since arrival. b Retrospective clustering ratio for cases with different time since arrivals, with 95% confidence intervals in parentheses. Dashes indicate ratios for which the ratio was zero and confidence intervals could not be calculated using the bootstrapping approach. See the caption to Fig. 3 for the interpretation of the colour coding