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Table 1 Study population characteristics across LLIN groups stratified by pre- and post-campaign periods. Summary statistics are presented as monthly averages/proportions across health facilities

From: A quasi-experimental study estimating the impact of long-lasting insecticidal nets with and without piperonyl butoxide on pregnancy outcomes

  Conventional LLINs PBO LLINs Conventional + PBO LLINs
Pre-period Post-period Pre-period Post-period Pre-period Post-period
Total number of observations 9129 4027 13,880 4473 5754 1822
Maternal age in years at delivery, mean (SD) 24.5 (1.2) 24.3 (1.0) 24.5 (1.0) 24.4 (1.9) 23.6 (0.9) 23.6 (0.6)
% Primigravidae, mean (SD) 22.4 (10.5) 25.8 (10.8) 19.4 (10.5) 23.6 (9.4) 29.9 (8.1) 32.1 (4.6)
% HIV prevalence, mean (SD) 3.2 (2.9) 3.2 (3.4) 3.3 (2.9) 3.5 (2.5) 3.5 (2.9) 3.8 (2.5)
Birth outcomes
 Number of deliveries, mean (SD) 44.8 (19.7) 49.7 (25.1) 62.0 (42.6) 66.8 (48.0) 71.0 (36.3) 86.8 (41.3)
 LBW infants per 100 births, mean (SD) 4.5 (4.7) 3.9 (4.1) 4.0 (4.2) 4.3 (3.8) 5.3 (4.2) 4.3 (2.6)
 Stillbirths per 100 deliveries, mean (SD) 1.7 (7.2) 1.1 (2.2) 3.9 (5.2) 3.3 (4.3) 4.0 (2.3) 5.2 (4.0)
  1. LBW low birthweight, LLIN long-lasting insecticidal net, PBO piperonyl butoxide, SD standard deviation