The Tokelau Island Migrant Study is outlined. It is a multi-disciplinary study of health and social change in the Tokelau islanders, following up emigrants to New Zealand (NZ). In this paper fertility and related aspects are examined, comparing pre-migrants (persons subsequently known to have emigrated to NZ) with non-migrants. Pre-migrant females tended to be younger, to marry later, to be less often childless and to have suffered more miscarriages, than non-migrants. Tokelau parity lagged behind other Polynesian populations due to later marriages, and reached a level below that of the more westernized Rarotongans and NZ Maoris.
Tokelau life expectancy was estimated to be 62·2–62·6 years for males and 62·9–66·4 years for females.