PMC6398998_01
Results of overlap of ICD-9 discharge diagnosis from the pregnant and not pregnant groups. ICD-9, international classification of diseases, 9th revision.
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FI190003-1
The overlap of the ICD-9 distinct codes was 24.3%, with 7.5% of the codes exclusively in the pregnancy group and 68.2% in the control group ( Fig. 1 ). 