| 1.1 Numbers improved Show forest plot | 7 | 338 | Risk Ratio (M‐H, Fixed, 95% CI) | 1.01 [0.80, 1.27] |
|
| 1.1.1 Chemical methods | 3 | 138 | Risk Ratio (M‐H, Fixed, 95% CI) | 0.94 [0.72, 1.24] |
| 1.1.2 Physical methods ‐ parallel‐group studies | 1 | 53 | Risk Ratio (M‐H, Fixed, 95% CI) | 1.11 [0.70, 1.74] |
| 1.1.3 Physical methods ‐ cross‐over studies | 2 | 98 | Risk Ratio (M‐H, Fixed, 95% CI) | 1.20 [0.57, 2.54] |
| 1.1.4 Combination methods | 1 | 49 | Risk Ratio (M‐H, Fixed, 95% CI) | 0.85 [0.21, 3.40] |
| 1.2 Asthma symptoms score Show forest plot | 20 | 1485 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.06 [‐0.16, 0.05] |
|
| 1.2.1 Chemical methods | 4 | 125 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.39 [0.04, 0.75] |
| 1.2.2 Physical methods ‐ parallel‐group studies | 11 | 1098 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.09 [‐0.21, 0.03] |
| 1.2.3 Physical methods ‐ cross‐over studies | 3 | 70 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.48 [‐0.97, 0.01] |
| 1.2.4 Combination methods | 2 | 192 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.01 [‐0.29, 0.28] |
| 1.3 Medication usage Show forest plot | 11 | 1115 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.05 [‐0.17, 0.07] |
|
| 1.3.1 Chemical methods | 1 | 23 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.89 [0.02, 1.75] |
| 1.3.2 Physical methods ‐ parallel‐group studies | 7 | 1020 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.06 [‐0.19, 0.06] |
| 1.3.3 Physical methods ‐ cross‐over studies | 3 | 72 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.17 [‐0.64, 0.29] |
| 1.4 FEV1 (forced expiratory volume in one second) Show forest plot | 15 | 675 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.13 [‐0.02, 0.28] |
|
| 1.4.1 Chemical methods | 4 | 125 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.05 [‐0.41, 0.30] |
| 1.4.2 Physical methods ‐ parallel‐group studies | 5 | 249 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.25 [‐0.00, 0.51] |
| 1.4.3 Physical methods ‐ cross‐over studies | 2 | 42 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.07 [‐0.53, 0.68] |
| 1.4.4 Combination methods | 4 | 259 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.12 [‐0.12, 0.36] |
| 1.5 PEFR morning (Peak Expiratory Flow Rate) Show forest plot | 24 | 1665 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.01 [‐0.08, 0.11] |
|
| 1.5.1 Chemical methods | 4 | 125 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.21 [‐0.56, 0.15] |
| 1.5.2 Physical methods ‐ parallel‐group studies | 12 | 1162 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.02 [‐0.10, 0.13] |
| 1.5.3 Physical methods ‐ cross‐over studies | 5 | 154 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.06 [‐0.26, 0.37] |
| 1.5.4 Combination methods | 3 | 224 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.09 [‐0.18, 0.35] |
| 1.6 PEFR evening (Peak Expiratory Flow Rate) Show forest plot | 13 | 467 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.06 [‐0.13, 0.24] |
|
| 1.6.1 Chemical methods | 2 | 53 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.49 [‐1.05, 0.07] |
| 1.6.2 Physical methods ‐ parallel‐group studies | 6 | 306 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.15 [‐0.08, 0.37] |
| 1.6.3 Physical methods ‐ cross‐over studies | 4 | 90 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.06 [‐0.35, 0.47] |
| 1.6.4 Combination methods | 1 | 18 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.03 [‐0.96, 0.89] |
| 1.7 PC20 (provocative concentration for 20% fall in FEV1) Show forest plot | 13 | 493 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.05 [‐0.13, 0.22] |
|
| 1.7.1 Chemical methods | 5 | 147 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.10 [‐0.43, 0.23] |
| 1.7.2 Physical methods, parallel‐group studies | 4 | 130 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.08 [‐0.27, 0.43] |
| 1.7.3 Physical methods ‐ cross‐over studies | 1 | 18 | Std. Mean Difference (IV, Fixed, 95% CI) | ‐0.12 [‐1.05, 0.80] |
| 1.7.4 Combination methods | 4 | 198 | Std. Mean Difference (IV, Fixed, 95% CI) | 0.15 [‐0.13, 0.43] |
