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Table 3 Quality checks for subsequent requests for data on births during the pre-randomisation phase

From: Using electronic patient records to assess the effect of a complex antenatal intervention in a cluster randomised controlled trial—data management experience from the DESiGN Trial team

  Request period Maternal weight Maternal height Maternal ethnicity Maternal parity Neonatal sex Gestational age at birth Neonatal birthweight
Number sites where variable was missing completely First request for pre-randomisation data 4 4 3 2 4 1 3
Second request for pre-randomisation 1 1 0 1 0 0 0
% complete at sites where variable provided (median; range) First request for pre-randomisation data 98.6% (85.6–100.0%) 98.6% (86.2–100.0%) 100.0% (67.2–100.0%) 99.2% (1.0–100.0%) 100.0% (99.2–100.0%) 100.0% (80.4–100.0%) 100.0% (99.0–100.0%)
Second request for pre-randomisation 96.5% (0.6–99.8%) 96.5% (0.6–99.8%) 98.9% (23.9–100.0%) 98.1% (20.3–100.0%) 100.0% (99.1–100.0%) 99.9% (89.0–100.0%) 99.9% (99.1–100.0%)