Table 5.
Standardized mean differences in medication usage 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 | −0.04 | −0.16 to 0.08 | 1043 | 0.49 | 0% |
| 1 barrier | −0.04 | −0.16 to 0.08 | 1043 | 0.49 | 0% |
| 2‐3 barriers | NA | NA | NA | NA | NA |
| Air purification | −0.17 | −0.64 to 0.29 | 72 | 0.46 | 0% |
| Mixed strategies | −0.05 | −0.17 to 0.07 | 1115 | 0.39 | 0% |
| Gøtzsche & Johansena | −0.05 | −0.17 to 0.07 | 1115 | 0.39 | 0% |
a
Standardized mean differences as calculated by Gøtzsche and Johansen37 with a fixed‐effect model.