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Table 4 Results from skin prick tests

From: Optimizing diagnostic tests for persulphate-induced respiratory diseases

  Hairdressers (n = 19) Symptomatic controls (n = 12) Healthy controls (n = 40)
Positive control (p/n) 19/0 12/0 40/0
Negative control (p/n) 2/17 0/12 0/40
Potassium persulphate (p/n) Conc. (%) 0/17 0/12 0/40
 2
 5
 7.5
Ammonium persulphate (p/n) Conc. (%) 0/17 0/12 0/40
 2
 5
 7.5
 10
 20
Sodium persulphate (p/n) Conc.  (%) 0/17 0/12 0/40
 2
 5
 7.5
 10
 20
  1. p positive, n negative