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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%