Table 3

Comparison of overall pre-DQA and post-DQA data completeness by site

			Change over time
Site	Time frame	Data completeness (%)	Mean difference (%)	95% CI	p Value
Site 1	Pre-DQA	88.0	+8.6	(7.7% to 9.5%)	<0.001
Site 1	Post-DQA	96.6	+8.6	(7.7% to 9.5%)	<0.001
Site 2	Pre-DQA	95.6	+2.7	(1.0% to 4.5%)	0.003
Site 2	Post-DQA	98.3	+2.7	(1.0% to 4.5%)	0.003
Site 3	Pre-DQA	94.6	+3.8	(2.9% to 4.7%)	<0.001
Site 3	Post-DQA	98.3	+3.8	(2.9% to 4.7%)	<0.001
Site 4	Pre-DQA	95.3	−1.7	(−2.6% to −0.7%)	<0.001
Site 4	Post-DQA	93.6	−1.7	(−2.6% to −0.7%)	<0.001

DQA,data quality audit.