Correlations between Facebook ratings, hospital size and register-based quality indicators, by Facebook site status*
| Ratings official sites | P value | Ratings unofficial sites | P value | Total | P value | |
| Hospital size | −0.60 | 0.014 | −0.40 | 0.014 | −0.40 | 0.003 |
| 30-day mortality† | 0.26 | 0.436 | 0.23 | 0.189 | 0.31 | 0.040 |
| 30-day readmission† | 0.28 | 0.397 | 0.01 | 0.939 | 0.12 | 0.455 |
*Spearman’s rank correlation coefficients.
†The number of hospitals in correlation analysis with 30-day mortality and 30-day readmission was 44. Both indicators were case-mix adjusted.