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Table 5 Levels of missing data for key variables after the second data download, comparing trial phases

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

  Pre-randomisation phase Trial comparison phase
Control Intervention Control Intervention
Maternal height 25.0% 11.0% 20.7% 3.0%
Maternal weight 15.3% 21.6% 12.0% 12.9%
Ethnicity 3.7% 14.1% 3.1% 7.1%
Parity 11.1% 15.2% 15.1% 7.4%
Neonatal sex 0.01% 0.1% 0.1% 0.5%
Neonatal birthweight 0.1% 0.3% 0.3% 0.5%
Gestational age 0.2% 4.8% 1.3% 3.8%