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Table 2 Logisitic regression of risk of stillbirth in all deliveries and of low birthweight in primigravidae, 1994–1999; one predictor was fitted in each analysis i.e. risk period as defined in the main text. Overall significance of risk period in Ndolage for stillbirth and LBW was p = 0.002 and p = 004 respectively, and for Kilosa was p = 0.55 and p = 0.25 respectively

From: The impact of endemic and epidemic malaria on the risk of stillbirth in two areas of Tanzania with different malaria transmission patterns

Malaria season OR for stillbirth Risk period* OR for lbw in PG*
Ndolage Kilosa   Ndolage Kilosa
Between malaria seasons Reference Reference Between risk periods Reference Reference
Dec 93-Feb 94 0.7 (0.3–1.6) N/A April 94-Aug 94 1.1 (0.8–1.7) N/A
April 94-Aug 94 1.3 (0.8–2.2) N/A Sep 94-Jan 95 1.7 (1.2–2.5)§ N/A
April 95-Sep 95 1.3 (0.8–2.1) N/A Sep 95-Jan 96 1.4 (0.9–2.0) N/A
April 96-July 96 0.6 (0.3–1.4) N/A Aug 96-Dec 96 0.7 (0.4–1.2) N/A
Oct 96-Jan 97 0.4 (0.1–1.1) N/A Feb 97-June 97 1.0 (0.6–1.5) N/A
Jun 97-Aug 97 0.4 (0.1–1.2) 1.2 (0.7–2.1) Sep 97-Jan 98 0.6 (0.3–1.0) 1.0 (0.7–1.4)
Nov 97-Aug 98** 1.9 (1.3–2.9) 0.8 (0.6–1.2) April 98-Aug 98 1.7 (1.1–2.6)§ 0.8 (0.6–1.2)
May 99-July 99 1.6 (0.9–2.9) 0.9 (0.5–1.6) Aug 99-Dec 99 1.2 (0.8–1.7) 1.3 (0.9–2.0)
  1. * twins and stillbirth excluded, risk period for low birthweight is calculated to start 3 months after the peak malaria period and to last for 5 months.
  2. **ENSO, p = 0.001, §p = 0.01