Patient demographics for patients who did and did not have laser treatment artefacts
| Count | Age (SD) | Gender (% female) | Ethnicity (fraction) | |
| With laser | 10 525 | 59.5 (10.0) | 51 | White=0.59 (Hispanic=0.95 non-Hispanic=0.05) Indian subcontinent origin=0.11 African Descent=0.07 Asian=0.02 Not specified=0.13 Other=0.08 |
| No laser | 10 525 | 54.7 (10.8) | 52 | White=0.51 (Hispanic=0.90 non-Hispanic=0.10) African Descent=0.13 Indian subcontinent origin=0.12 Asian=0.03 Not specified=0.14 Other=0.07 |