Best models of determinants of age at first birth in adult Mosuo males in duolocal and mixed households as a function of education, co-resident kin and household wealth (n = 266). Controlling for cohort and education, the most informative models contain income variables. Control model includes age cohort + years of education; female kin represents number of sisters + number of female cousins + number of female elders; male kin represents number of brothers + number of male cousins + number of male elders; wealth represents number of livestock + averaged size of land + tourist income (0 represents the household has no tourism income; and 1 represents the household has tourism income); K, no. of parameters in the model; ΔAIC, deviation in AIC; ωi, Akaike weight; LL, log-likelihood.