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Table 3 Difference in differences (DID) with time trend and interaction term

From: Effectiveness of a health education intervention on the use of long-lasting insecticidal nets for the prevention of malaria in pregnant women of Pakistan: a quasi-experimental study

Variables Model-1a Model-2b Model-3c Model-4d
Treatment 0.430 − 0.020 0.106 − 0.238
(0.276) (0.221) (0.364) (0.277)
Time (Post-intervention) 0.570** 0.320 0.570** 0.320
(0.276) (0.221) (0.284) (0.229)
Interaction term 4.170*** 3.360*** 4.170*** 3.360***
(0.390) (0.312) (0.382) (0.309)
Confounders No No Yes Yes
R square 0.540 0.500 0.570 0.530
Prob > F 0.000 0.000 0.000 0.000
  1. Confounders: age, education, income, etc
  2. Standard errors in parentheses; *p < 0.1, **p < 0.05, ***p < 0.01
  3. aModel 1: Estimation of knowledge without confounders
  4. bModel 2: Estimation of use of LLINs without confounders
  5. cModel 3: Estimation of knowledge with confounders
  6. dModel 4: Estimation of use of LLINs with confounders