Population Council, Mexico City, Mexico (CE), K.E.M. Hospital, Pune, India (SA, KC), Office of Population Research, Princeton University, Princeton, New Jersey (AH, JT), and the Population Council, Johannesburg, South Africa (KB).
Address reprint requests to: Charlotte Ellertson, Population Council, Escondida 110, Colonia Villa Coyoacan, Mexico DF 04000, Mexico; E-mail: [email protected].
The David and Lucile Packard Foundation (Los Altos, California) funded the study.
Anna Glasier suggested several features of the study design. Martha Campbell and Beverly Winikoff reviewed the draft protocol and gave helpful comments. Sunil Patel, Annik Sorhaindo, and Sarah Thomas organized, checked, and helped to interpret the data. John Skibiak pointed out an interpretation error in the earlier literature critical to our own analysis. German Rodriguez guided our statistical analysis.
Received November 20, 2000. Received in revised form May 30, 2001. Accepted June 7, 2001.