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Table 1 Comparison of participation rates, ages and asthma outcomes between centres.

From: A methodology to establish a database to study gene environment interactions for childhood asthma

Centre Number of children Mean age (years) Median SIMD decile Mean % FEV1 Median FENO(SEM), ppb Median BTS treatment step
  Invited Participated Participants Non participants Participants Non participants    
Aberdeen 167 93 8.8 (4.1) 9.1 (4.3) 7 7 96 (17) 27 (6) 3
        n = 41 n = 41  
Dundee 220 91 8.1 (4.2) 9.0 (4.4) 6 5 100 (17) 25 (6) 3
        n = 45 n = 44  
Edinburgh 271 140 8.5 (4.1) 9.8 (4.3) 7 5 91 (11) 16 (4) 3
        n = 38 n = 54  
Elgin 70 29 8.9 (4.1) 9.8 (4.3) 6.5 5 103 (12) 17 (6) 3
        n = 12 n = 9  
Kirkcaldy 80 42 6.8 (3.3) 8.5 (3.6) 5 4 93 (14) 11 (18) 3
        n = 9 n = 8  
Melrose 24 17 11.1 (3.0) 10.5 (3.8) 7 5 93 (9) 14 (7) 3
        n = 13 n = 15  
Perth 119 45 10.0 (3.4) 9.8 (3.7) 6 7 104 (12) 41 (10) 3
        n = 14 n = 14  
Other 94 64 9.0 (4.3) 8.3 (4.3) 4 4 none None 2.5
Overall 1045 501 8.6 (3.9) 9.2 (4.0)* 6 † 6 97 (15)† 18 (2) 3 (2, 3)†
  1. SIMD = Scottish Index of Multiple Deprivation, SEM = Standard Error of Mean, BTS = British Thoracic Society.*p = 0.022 for comparison between participants and non participants. † p value for trend tests for %FEV1, SIMD decile and BTS severity between centres <0.05.