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Table 4 Distribution of age and gender during the recruitment phases

From: Randomized double-blind placebo-controlled trial of sublingual immunotherapy in children with house dust mite allergy in primary care: study design and recruitment

  Total Male Age group
6–11 years
  n n % n %
Total mailed 5986 3066 51.2% 2369 39.6%
Letter returned (irrespective of answer) 2555 1331 52.1% 1036 40.5%
Letter returned positive response 1072 592 55.2% 471 43.9%
Telephone screening positive 500 279 55.8% 214 42.8%
Screening visit positive 251 149 59.4% 1 122 48.6%2
  1. 1: p = 0.006 (compared with 5986 children who were initially contacted)
  2. 2: p = 0.025 (compared with 5986 children who were initially contacted)