Ricard Tresserras|Jaume Canela|José Luis Domínguez Álvarez|Joan Sentís|L. Salleras
Infant mortality, per capita income, and adult illiteracy: an ecological approach.
Government of Catalonia
ecological association infant mortality rate im per capita income pi prevalence adult illiteracy ai studied using countries unit analysis negative association im pi 1960 1982 observed sample correlation coefficient r 625 r 729 respectively p less 05 correlation im ai found men women r 827 r 855 respectively p less 05 ecological relative risks 743 men 582 women 95 confidence intervals 5161071 436775 respectively association im pi shows slight significant improvement 1960 1982 ai considered good predictor im countries