Fig. 3

Analysis of the age-groups of the pulmonary cases with whom cases notified during 2009–11 were clustered retrospectively. a Proportions of cases in each age group who were retrospectively clustered with pulmonary cases in other age groups. b Retrospective clustering ratio for cases in each age group. Yellow and red cells show less and more retrospective clustering respectively with pulmonary cases in a given age group than might be expected, 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. Unshaded cells show ratios for which there is neither more nor less retrospective clustering than might be expected