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Table 3 Difference-in-Differences estimation results. The treatment effect (effect of the terrorist attack) is given by the Treatment group x After coefficients and can be interpreted as the absolute percentage decrease in ED visits caused by the attack. The predicted reduction hence ranges from 7.03% (Model 2) to 8.98% (Model 3). The regressions also control for Easter holiday, month, weekday, age group, holiday and age group x holiday fixed effects. These coefficients are omitted for the sake of readability

From: The effect of a terrorist attack on emergency department inflow: an observation study using difference-in-differences methodology

Dependent variable = log(Visits) Model 1 5 Day Window Model 2 10 Day Window Model 3 15 Day Window
Treatment group x After -0.0728** -0.0703** -0.0898***
(0.0309) (0.0265) (0.0197)
Treatment group 0.173** 0.176** 0.176**
(0.0760) (0.0793) (0.0797)
After 0.0139 0.00465 0.0347***
(0.0125) (0.0119) (0.00897)
Observations 2430 4860 7290
F Statistic 15.48*** 15.03*** 18.63***
  1. Note: **p<0.05, ***p<0.01. Cluster robust standard errors in parentheses