Levels and trends of emigration by sex, Manhiça, 1998 to 2005. Calculated from the Manhiça DSS data. Outmigration Males – emigration rate per 1000 person-years, males, Manhiça DSS area. Outmigration Females – emigration rate per 1000 person-years, females, Manhiça DSS area. Emigration rate ratio comparing males to females, after controlling for age was 1.173, 95% CI = 1.119 - 1.229 and P < 0.001.