| Study characteristics |
| Methods |
Randomisation method: not described
Double‐blind
Physical |
| Participants |
N = 40
27 children aged 4 to 16 years and 13 adults aged 20 to 67 years
Positive skin prick test |
| Interventions |
Test 1: mechanical ventilation system with heat recovery and high‐efficiency vacuum cleaner
Test 2: mechanical ventilation system with heat recovery
Test 3: high‐efficiency vacuum cleaner
Control: no intervention
12 months |
| Outcomes |
PEFR morning and evening, FEV1, PC20, asthma symptoms, medication usage |
| Notes |
No reduction in mite allergens. Ten homes that were unsuitable for ventilation system were randomised to test 3 or control. Numbers in each group not stated. No useable data in article. |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Allocation concealment (selection bias) |
Unclear risk |
Information not available |
