Table 2 Activity before, during, and after WannaCry across all trusts

From: A retrospective impact analysis of the WannaCry cyberattack on the NHS

  Total admissions Emergency admissions Elective admissions Day case admissions Elective admissions excl. day cases A&E attendances Deaths in A&E Outpatient appointments Outpatient attendances Outpatient cancellations
Panel A: Point estimates and confidence intervals of difference in average daily activity per hospital in the weeks before, during, and after WannaCry across all trusts compared to baseline period
 −2 5.5 3 3.5 4.3 0.6 8.4 0 46 44.6 −3.6
  [1.9, 9.0] [2.1, 3.8] [0.4, 6.6] [1.6, 7.0] [−0.2, 1.3] [6.3, 10.4] [−0.0, 0.1] [2.7, 89.3] [11.5, 77.7] [−10.6, 3.4]
 −1 4.8 1.6 4.1 3.6 0.8 5.1 0 70.9 68.9 −3.5
  [1.4, 8.3] [0.7, 2.4] [1.1, 7.1] [1.1, 6.2] [0.1, 1.5] [3.1, 7.2] [0.0, 0.1] [28.3, 113.4] [36.4, 101.3] [−10.3, 3.4]
 WannaCry week 0.2 1.1 −0.3 −0.5 0.2 −3.2 0 26.3 21.1 4.4
  [−3.3, 3.7] [0.2, 1.9] [−3.3, 2.8] [−3.0, 2.1] [−0.5, 0.9] [−5.3, −1.2] [−0.0, 0.0] [−16.3, 68.9] [−11.4, 53.6] [−2.5, 11.2]
 +1 4.4 2.6 2.5 2.1 0.7 2.3 0 34.3 32.3 −4.2
  [1.0, 7.9] [1.8, 3.5] [−0.5, 5.5] [−0.5, 4.6] [0.0, 1.4] [0.2, 4.3] [−0.1, 0.0] [−8.2, 76.9] [−0.2, 64.8] [−11.1, 2.7]
 +2 −0.4 1.7 −2.3 −1.6 −0.8 10.6 0 −93.3 −74.8 −8.6
  [−3.9, 3.1] [0.8, 2.5] [−5.4, 0.8] [−4.2, 1.1] [−1.5, −0.1] [8.6, 12.7] [−0.0, 0.1] [−136.8, −49.9] [−108.0, −41.6] [−15.6, −1.6]
 N 17,882 17,299 15,790 13,096 15,070 13,832 13,832 17,114 17,114 17,114
Mean per trust per day 210 107.2 120.4 119.6 22.2 347.5 0.3 1603.9 1258.6 119.8
Panel B: Expected national activity during with and without WannaCry
 Predicted activity 296,718.9 143,798 151,903.5 126,568 26,964.8 365,833 310 2,285,402.3 1,790,122.8 176,435.8
 Predicted activity if WannaCry week was similar to baseline week 296,449.1 142,379.4 152,208 127,038.4 26,765.1 369,256.9 320.6 2,250,567.3 1,762,225.9 170,669.2
 Estimated difference 269.8 1418.6 −304.5 −470.4 199.6 −3423.9 −10.6 34,834.9 27,896.8 5766.6
  [−4489, 5028.7] [317.3, 2519.9] [−3996.6, 3387.6] [−3097, 2156.2] [−611.8, 1011.1] [−5592.3, −1255.5] [−48, 26.8] [−21525.2, 91195.1] [−15100.2, 70893.9] [−3316.6, 14849.9]
  1. Panel A: The dependent variable is activity per trust per day. Point estimates reflect the average difference in daily activity across all hospitals in weeks before, during, and after WannaCry compared to the baseline, which is any other day between 1 April and 30 June 2017. Regression controls for day of week, bank holiday, and hospital fixed effects. 95% confidence intervals in squared brackets. Panel B: Expected activity is the predicted activity from the regression
  2. A&E accident and emergency