Table 3.
Standardized mean differences in FEV1 related to environmental strategy in the meta‐analysis by Gøtzsche and Johansen37
| Strategy | SMD | 95% CI | Patients (n) | P‐value | I 2 |
|---|---|---|---|---|---|
| Sojourn high altitude | NA | NA | NA | NA | NA |
| Total avoidance | NA | NA | NA | NA | NA |
| Exposure‐based | NA | NA | NA | NA | NA |
| Concurrent bedroom | 0.14 | −0.02 to 0.29 | 633 | 0.08 | 0% |
| 1 barrier | 0.11 | −0.11 to 0.33 | 332 | 0.32 | 0% |
| 2‐3 barriers | 0.17 | −0.06 to 0.40 | 301 | 0.15 | 28% |
| Air purification | 0.07 | −0.53 to 0.68 | 42 | 0.81 | 0% |
| Mixed strategies | 0.13 | −0.02 to 0.29 | 675 | 0.09 | 0% |
| Gøtzsche & Johansena | 0.13 | −0.02 to 0.28 | 675 | 0.09 | 0% |
a
Standardized mean differences as calculated by Gøtzsche and Johansen37 with a fixed‐effect model.