What's the denominator?
Victora
C G
CG
Mestrado em Epidemiologia, Universidade Federal de Pelotas, Brazil.
D015981:Epidemiologic Factors; D004812:Epidemiologic Methods; D006801:Humans; D015994:Incidence; D011153:Population; D015995:Prevalence; D012306:Risk; D013223:Statistics as Topic