Menarche, pregnancy, birth spacing and menopause among the Agta women foragers of Cagayan Province, Luzon, the Philippines

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Abstract
The reproductive histories of 74 postmenarcheal Agta Negrito women, tropical foragers of Cagayan province, northeastern Luzon, the Philippines are described and analyzed in comparison with data collected by Howell on Dobe Kung hunter-gatherers. Among the Agta, mean age at menarche is 17, mean age at first live birth is 20.14 yr, mean completed parity is 6.53 and mean age at menopause is 44. Average height is 141.24 cm and average weight 36.72 kg. No time trends were detected in age at menarche and age at first live birth among the Agta. Average spacing between live births where an infant survives until the birth of the next sibling was 2.85 yr. Compared to the Dobe Kung, Agta women have later menarche, but shorter birth spacing and a longer active childbearing span.