Meta-analysis based on questionnaires
| Groups | Studies (n) | Effect size and 95% CI | Test of null (two-tailed) | |||||
| Point estimate | SE | Variance | Lower limit | Upper limit | Z value | P value | ||
| EORTC QLQ-C30 | 26 | 64.72 | 2.79 | 7.81 | 59.24 | 70.20 | 23.16 | 0.00 |
| FACT- B | 17 | 84.39 | 10.28 | 105.70 | 64.24 | 104.54 | 8.21 | 0.00 |
| QLQ-BR23 | 8 | 66.33 | 1.82 | 3.32 | 62.76 | 69.90 | 36.41 | 0.00 |
| SF-36 | 9 | 57.23 | 4.89 | 23.91 | 47.65 | 66.82 | 11.70 | 0.00 |