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Table 2 Difference-in-differences method

From: Impact of free maternal health care policy on maternal health care utilization and perinatal mortality in Ghana: protocol design for historical cohort study

  Before treatment After treatment Difference
Treatment (T) X0 Y0 T = Y0–X0
Comparison (C) X1 Y1 C = Y1–X1
Difference X0–X1 Y0–Y1 DD = (Y0–X0) – (Y1–X1) = T-C
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