Distribution of demographic variables and health measures by frailty status.

<p>Distribution of demographic variables and health measures by frailty status.</p

Frailty prevalence by race and age group.

<p>Frailty prevalence by race and age group.</p

Concurrent functional measures by frailty group.

<p>Concurrent functional measures by frailty group.</p

Overall survival by initial frailty group, stratified by age at enrollment.

<p>Overall survival by initial frailty group, stratified by age at enrollment.</p

All-cause mortality hazard ratios and 95% confidence intervals by frailty status and demographics.

<p>All-cause mortality hazard ratios and 95% confidence intervals by frailty status and demographics.</p

Tested birds

Birds were sampled in the wild in four biogeographic regions (Region): NWA - Northwest Africa, NWI - Northwest Iberia, TRC - Transcaucasia, WGC - Western Greater Caucasus. Bird ID is the unique identifier for each bird sampled. Repeated bird IDs indicate multiple infections in the same bird. Date is when the sample was taken in the field. Parasite lineage is a unique identifier and 'none' indicates that no haemosporidian parasite lineages were found. Please see the original article for details of methods