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Annual birthweight indicators for singleton pregnancies reported by DELIMAL health centres in Burkina Faso between 2002–2006 (pre-intervention, and intervention April 2004–2006). Point values indicate the year of data collection. The odds ratio refers to excess low birthweight (<2500 g) prevalence in primigravidae compared to multigravidae. Areas receiving SP-ITPp intervention alone (■); areas receiving SP-ITPp combined with a pregnancy health promotion campaign (●).
