|
Reasons not to participate in the consecutive recruitment phases |
||
| Reasons not to participate |
Total (n) |
Percentage |
|
|
||
| Letter returned (n = 1483) |
||
| Few or no complaints |
710 |
48.4% |
| Other allergy |
240 |
16.4% |
| Study too burdensome |
202 |
13.8% |
| No interest in the study |
186 |
12.6% |
| No reason |
145 |
9.8% |
| Telephone screening (n = 572) |
||
| No HDM allergy |
159 |
27.8% |
| Low symptom score (<4/12) |
158 |
27.6% |
| Not interested in study |
57 |
10.0% |
| Severe asthma |
39 |
6.8% |
| Language barrier |
27 |
4.7% |
| Use of immunotherapy in the last 3 years |
19 |
3.3% |
| Refusing blood sample to be taken |
17 |
3.0% |
| Age (out of range) |
15 |
2.6% |
| Allergic complaints <1 year |
12 |
2.1% |
| History of severe allergic reaction |
9 |
1.6% |
| Systemic disease |
8 |
1.4% |
| Use of nasal corticosteroids 1 month before baseline |
7 |
1.2% |
| Answer forms received after deadline of inclusion period |
45 |
7.9% |
| Screening visit (n = 249) |
||
| Only grass pollen or tree pollen sensitization |
81 |
32.5% |
| No sensitization detectable |
75 |
30.1% |
| Sensitive to pet at home (confirmed by RAST) |
60 |
24.1% |
| No informed consent |
29 |
11.7% |
| Use of unallowed co-medication |
4 |
1.6% |
de Bot et al. BMC Family Practice 2008 9:59 doi:10.1186/1471-2296-9-59 |
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