| Study characteristics |
| Methods |
Cross‐over
Randomisation method: not described
Single‐blind
Physical |
| Participants |
N = 31
Children aged 5 to 15 years
Positive skin prick test and/or IgE |
| Interventions |
Test: covers (Intervent) for mattress, duvet and pillow, wiped down weekly
Control: polycotton covers
Each period lasted 3 months |
| Outcomes |
Asthma symptoms, medication use (bronchodilators), FEV1, PEFR morning and evening, PC20 |
| Notes |
Reduction in mite allergens. No useful data (medians and ranges), PEFR in the morning was 257 versus 282. |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Allocation concealment (selection bias) |
Unclear risk |
Information not available |
