1 research brief the birth to twenty bt20 study nutrition dr jenny mackeown medical council health and development group ten btt commenced in 1990 as a 10 year longitudinal observational continuing 2000 designed follow factors associated with survival of urban children from all south african communities living johannesburg soweto area gauteng province it was initiated ensure that impact urbanisation predominantly positive future policy be based on epidemiological evidence rather than ideology or tradition interceptions took place 1991 1995 1997 1999 when were 5 7 9 years age respectively is planned continue for next 2001 2010 one additional interception 2003 13 this largest longest running s africa also first only nutrient intake thus provides unique information addition
