Correction to: Health and Quality of Life Outcomes (2017) 15:247
https://doi.org/10.1186/s12955-017-0815-5
Unfortunately, the original version of this article [1] contained one error around the EQ-5D visual analogue scale (VAS) scores affecting a few patients.
In Table 4 (Table 1 here), the column presenting the correlations between the FACT-Melanoma (FACT-M) and Merkel cell carcinoma (MCC)-specific scores and the EQ-5D VAS scores have been revised. The corrected table is shown below. None of the interpretation of results or conclusions is affected.
Table 1.
Internal consistency reliability and clinical and concurrent validity of the FACT-M and MCC-specific scores in the mMCC population
| FACT-M Subscales and Summary scores | # items | Cronbach’s alpha[a] | Scale structure | ECOG PS (mean [SD]) | EQ-5D VAS | EQ-5D index | |||
|---|---|---|---|---|---|---|---|---|---|
| Range of item-subscale correlations[b] | Convergent[c]/Divergent[d] validity (% of items) | 0 (n = 39) | 1 (N = 31) | p-value[e] | Correlation[b] | Correlation [b] | |||
| FACT-G subscales | |||||||||
| Physical well-being (PWB) | 7 | 0.86 | 0.49–0.81 | 100/ 57 | 23.21 (5.02) | 20.10 (6.08) | 0.0221 | 0.59 | 0.75 |
| Social/Family well-being (SWB) | 7 | 0.81 | 0.41–0.86 | 100/ 71 | 23.03 (4.78) | 21.49 (5.30) | 0.2065 | 0.19 | 0.24 |
| Emotional well-being (EWB) | 6 | 0.83 | 0.53–0.75 | 100/ 67 | 17.97 (4.22) | 16.87 (4.95) | 0.3179 | 0.36 | 0.53 |
| Functional well-being (FWB) | 7 | 0.87 | 0.49–0.82 | 100/ 71 | 17.41 (6.68) | 15.48 (5.90) | 0.2113 | 0.44 | 0.63 |
| Melanoma-specific subscales | |||||||||
| Melanoma Subscale (MS) | 16 | 0.85 | 0.24–0.85 | 75 / 31 | 51.64 (8.93) | 49.10 (9.02) | 0.2427 | 0.55 | 0.75 |
| Melanoma surgery Scale (MSS) | 8 | 0.84 | 0.15–0.81 | 88 / 63 | 26.51 (6.19) | 25.58 (6.03) | 0.5290 | 0.26 | 0.51 |
| Summary scales | |||||||||
| FACT-M TOI | 30 | 0.94 | – | – | 92.26 (18.75) | 84.68 (19.40) | 0.1026 | 0.58 | 0.78 |
| FACT-G total score | 27 | 0.94 | – | – | 81.62 (17.25) | 73.95 (17.62) | 0.0713 | 0.50 | 0.67 |
| FACT-M total score | 43 | 0.96 | – | – | 133.26 (24.66) | 123.04 (25.21) | 0.0926 | 0.55 | 0.74 |
| MCC-Specific scores | |||||||||
| Physical function score (PF) | 6 | 0.88 | – | – | 16.38 (5.67) | 13.71 (5.54) | 0.0519 | 0.52 | 0.72 |
| Psychological impact score (PI) | 6 | 0.85 | – | – | 17.82 (4.40) | 16.87 (5.18) | 0.4101 | 0.36 | 0.52 |
| MCC summary score | 12 | 0.91 | – | – | 34.21 (8.99) | 30.58 (9.94) | 0.1145 | 0.49 | 0.69 |
# number, ECOG PS Eastern Cooperative Oncology Group performance score, MCC Merkel cell carcinoma, PAS PRO analysis set, SD Standard deviation, TOI Trial Outcome Index
[a] Recommended threshold α > 0.7; [b] Pearson correlation coefficients; [c] % of items correlated with its own dimension ≥0.4; [d] % of items correlated with its own dimension higher that the correlation with any other dimension; [e] p-value from t-test of score between the two ECOG performance status groups at baseline
Internal consistency reliability and clinical validity were assessed in the PAS (N = 70)
ECOG PS: 0 = Fully active; 1 = Restricted in physically strenuous activity
Reference
- 1.Bharmal M, Fofana F, Barbosa CD, Williams P, Mahnke L, Marrel A, et al. Psychometric properties of the FACT-M questionnaire in patients with Merkel cell carcinoma. Health Qual Life Outcomes. 2017;15(1):247. doi: 10.1186/s12955-017-0815-5. [DOI] [PMC free article] [PubMed] [Google Scholar]