| Outcome | Watson 1997 SD from correlation imputation | N studies/N participants | Mean difference (IV, fixed, 95% CI) | Watson 1997 SD taken from other studies | N studies/N participants | Mean difference (IV, fixed, 95% CI) (result presented in text) |
| SGRQ overall score 6 MTHS | SD = 22 | 3/269 | ‐2.07 (‐8.34 to 4.20) | SD = 12 | 3/269 | ‐0.33 (‐3.03 to 2.37) |
| SGRQ symptom score 6 MTHS | SD = 28.6 | 3/235 | ‐1.53 (‐8.21 to 5.16) | SD = 22 | 3/235 | ‐2.18 (‐8.36 to 4.00) |
| SGRQ activity limitation score 6 MTHS | SD = 32 | 3/269 | 2.35 (‐1.40 to 6.09) | SD = 14 | 3/269 | 1.41 (‐1.99 to 4.82) |
| SGRQ impact score 6 MTHS | SD = 20 | 3/269 | ‐1.13 (‐4.28 to 2.01) | SD = 12 | 3/269 | ‐1.53 (‐4.45 to 1.39) |
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