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Table 3 Characteristics of hairdressers with a negative specific inhalation challenge

From: Optimizing diagnostic tests for persulphate-induced respiratory diseases

ID Age (y) WRAS WRRS Stop/resume test Duration of exposure before symptoms (y) Time from exposure to symptoms Time since last exposure to persulphates (y) Baseline FEV1/FVC (% of pred.)
1 52 + + N 3 Within hours 5 86 (109 %)
3 45 + + P 20 Within hours CE 83 (104 %)
4 49 + + P 28 Within minutes CE 65 (81 %)
Rever: 2.9 %
6 30 + P 10 Within minutes 3 81 (97 %)
7 27 + + P 1 Not definable 1 84.9 (103.3 %)
9 20 + + P 1 Within minutes CE 98 (116 %)
11 43 + + P 20 Within hours CE 83 (103 %)
12 23 + + N 3 Within hours CE 74 (88 %)
Rever: 12 %
13 46 + N 2 Not definable 3 83 (103 %)
14 27 + + P 7 Within minutes CE 83 (99 %)
15 31 + + P 4 Within minutes 1/2 75 (90 %)
Rever: 7.8 %
17 20 + + P 4 Not definable 1/6 91 (108 %)
18 29 + + P 8 Within hours CE 91 (109 %)
ID Age (y) MCh PD20 (µg) FeNO (ppb) T-IgE (kU/L) Atopya HRT PP (mg/mL) HRT SP (mg/mL) HRT AP (mg/mL)
1 52 N 25 3.6 No 1.25 0.63 1.25
3 45 N 9.9 6.7 No N 5.0 2.5
4 49 N 16.0 2.2 No 10.0 10.0 5.0
6 30 400 64.1 155 No N 10.0 5.0
7 27 N 19.3 127 D N 5.0 2.5
9 20 N 6.6 <2 No N 10.0 5.0
11 43 N 7.1 22.5 No N 10.0 5.0
12 23 N 21.8 122 No 10.0 5.0 2.5
13 46 626 12.1 35.4 No N 5.0 1.25
14 27 N 11.8 3.7 No N 10.0 5.0
15 31 720 9.0 308 D 5.0 2.5 1.25
17 20 N 9.0 4.3 No 10.0 2.5 2.5
18 29 N 19.7 58.3 No N N N
  1. y years, WRAS work-related asthma symptoms, WRRS work-related rhinitis symptoms, MCh methacholine challenge, FeNO fractional exhaled nitrogen oxide (increased values in italics), T-IgE total immunoglobulin E, HRT histamine release test, PP potassium persulphate, AP ammonium persulphate, SP sodium persulphate, SIC specific inhalation challenge, N negative, P positive, CE currently exposed, D dermographism, R rhinitis, A asthma
  2. aDefined as ≥1 positive SPT to common inhalant allergens