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Table 1 Impact of synthetic cannabinoid control measures on emergency department (ED) visits, New York City, 2015

From: Novel use of syndromic surveillance to monitor the impact of synthetic cannabinoid control measures on morbidity

  ED visit 10 days pre-intervention ED visits 10 days post-intervention  
Number Rate Number Rate Difference
Intervention
 A (Treatment) 33 117.2 22 78.1 − 39.1
 A (Neighborhood control) 30 23.6 29 22.8 −0.8
 A (City control) 116 1.7 111 1.6 −0.1
  Difference-in-difference (Treatment - Neighborhood) −38.3
  Difference-in-difference (Treatment - City) −39.0
 B (Treatment) 40 142.0 24 85.2 −56.8
 B (Neighborhood control) 47 36.9 43 33.8 −3.1
 B (City control) 341 5.0 327 4.8 −0.2
  Difference-in-difference (Treatment - Neighborhood) −53.7
  Difference-in-difference (Treatment - City) −56.6
 C (Treatment) 330 4.8 232 3.4 −1.4
  1. Notes. Rates expressed per 100,000 New York City residents
  2. A-Commissioner’s Order served to stores in a single ZIP code
  3. B-Product removal in a single ZIP code
  4. C-Citywide product removal