Baseline characteristics of clusters and individuals by trial arm in the 20 original clusters and the eight supplementary clusters.

aAs defined by the 2006 census (per capita income less than twice the value of a standardized basic basket of food) [57].bRepresents total sample per trial arm at baseline. There were small amounts of missing data (maximum five participants per outcome); data available but not shown.cMean (standard deviation).dMedian (interquartile range).GDS-15, 15-item Geriatric Depression Scale; MMSE, Mini Mental State Examination; n.d., no data, more limited information was collected for the supplementary sample; SF-36, 36-item Short-Form health survey. Scores calculated using an algorithm derived for Chilean older people [58].