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Table 3 Risk reduction on emergency department (ED) visits and hospital readmission (RA) visits due to scopolamine patch use among children with drooling

From: Efficacy of scopolamine transdermal patch in children with sialorrhea in a pediatric tertiary care hospital

Emergency department visits (ED):
  Rate of ED visits due to drooling before scopolamine patch use (CER) % 33.0
  Rate of ED visits due to drooling after scopolamine patch use (EER) % 5.4
  ARR on ED visits %= CER - EER = 33.0–5.4 27.6 (95%CI:9.4–45.6, p < 0.001))
  RRR on ER visits % = (CER – EER)/CER = (33.0–5.4)/33.0 86.0
  Relative risk (RR) = EER/CER = 5.4/33.0 0.16
Readmission visits (RA):
  Rate of RA visits due to drooling before scopolamine patch use (CER) % 44.4
  Rate of RA visits due to drooling after scopolamine patch use (EER) % 8.7
  ARR on RA visits %= CER - EER = 44.4–8.7 35.7(95% CI: 15.7–55.7, p < 0.001)
  RRR on RA visits %= (CER – EER)/CER = (44.4–8.7)/44.4 67.1
  Relative risk (RR) = EER/CER = 8.7/44.4 0.20
  1. CER Control event rate, EER Experimental event rate, RR Relative risk, ARR Absolute risk reduction, RRR Relative risk reduction