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

Table 4 Distribution of age and gender during the recruitment phases

	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

ISSN: 2731-4553