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Table 1 Average treatment effect on the treated estimations among three groups

From: Effective methods for reactivating inactive blood donors: a stratified randomised controlled study

  Point Estimate Standard Error 95% CI Z P
Telephone vs. SMS 0.023 0.008 0.007, 0.038 2.885 0.004
Telephone vs. Control 0.060 0.009 0.041, 0.078 6.363 < 0.001
SMS vs. Control 0.004 0.011 −0.017, 0.025 0.372 0.710