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Table 1 Characteristics of Subgroups Included in the Analysis*

From: Long-Term Effects of Allergen Sensitization and Exposure in Adult Asthma: A Prospective Study

  Attended Both Visits Allergen Samples Collected Bronchial Challenge at Both Visits
  Yes No Yes No Yes No
  N = 200 N = 199 N = 165 N = 35 N = 86 N = 79
Age (years) 44 35† 45 41 41 50†
   (n = 195)     
Sex (% males) 40% 44% 39% 43% 31% 48%†
Years with asthma 23 17† 23 23 20 25†
  (n = 179) (n = 132) (n = 150) (n = 31) (n = 72) (n = 78)
% on ICS treatment 72% 58%† 73% 66% 60% 86%†
  (n = 199)    (n = 34)   
ICS dose (μg) 967 1034 948 1064 830 1042
  (n = 137) (n = 101) (n = 115) (n = 22) (n = 51) (n = 64)
Smoking status (%)       
   Never 61% 61% 59% 71% 65% 52%
   Ex 28% 23% 30% 17% 27% 33%
   Current 12% 16% 12% 11% 8% 15%
Spirometry       
   FEV1 (l) 2.50 3.05† 2.51 2.49 2.87 2.11†
  (n = 197) (n = 199) (n = 164) (n = 33)   (n = 78)
   FVC (l) 3.48 3.80† 3.48 3.46 3.73 3.27†
  (n = 166) (n = 110) (n = 137) (n = 29) (n = 63) (n = 74)
   Reversibility (%) 14% 13% 14% 14% 8% 18%†
  (n = 124) (n = 73) (n = 106) (n = 18) (n = 40) (n = 66)
PD20 GM (μg) 0.412 0.538 0.422 0.398 0.394 0.590
  (n = 118) (n = 146) (n = 103) (n = 15)   (n = 17)
eNO GM (ppb) 11.09 9.76 11.04 11.41 10.77 11.35
  (n = 173) (n = 160) (n = 149) (n = 24) (n = 80) (n = 69)
Atopy (%) 84% 83% 82% 94% 85% 80%
  (n = 195) (n = 195) (n = 164) (n = 31) (n = 85) (n = 79)
  1. *Where data not available for all subjects in group, the number included in the analysis is shown in parentheses.
  2. P < 0.05 "no" vs "yes".
  3. ICS, inhaled corticosteroids.