Comparison of the operation data, patients’ demographics and baseline characteristics between the trained and untrained group
| Clinical characteristic | Trained group | Untrained group | P value |
| Operation data | |||
| No of operations | 1656 | 1315 | |
| No of surgeons | 21 | 20 | |
| No of cases per surgeon, mean (SD) | 78.9 (15.3) | 65.8 (16.2) | 0.01 |
| Laterality (%) | |||
| Right | 838 (50.6) | 685 (52.1) | 0.41 |
| Left | 818 (49.4) | 630 (47.9) | |
| Anaesthetic method* (%) | 1557 | 1110 | |
| Topical | 133 (8.5) | 29 (2.6) | <0.001 |
| Subconjunctival | 273 (17.5) | 37 (3.3) | |
| Retrobulbar/peribulbar | 1116 (71.7) | 1033 (93.1) | |
| General anaesthesia | 35 (2.2) | 11 (1) | |
| Patient demographics | |||
| Age, mean (SD) | 69.44 (8.75) | 68.9 (8.9) | 0.10 |
| Gender (%) | |||
| Male | 633 (38.2) | 477 (36.3) | 0.28 |
| Female | 1023 (61.8) | 838 (63.7) | |
| Systemic comorbidities (%) | |||
| Diabetes | 632 (38.2) | 448 (34.1) | 0.02 |
| Hypertension | 825 (49.8) | 788 (59.9) | <0.001 |
| Heart disease | 74 (4.6) | 82 (6.2) | 0.047 |
| Chronic kidney disease | 108 (6.5) | 69 (5.2) | 0.15 |
| Ocular status | |||
| Preoperative BCVA, LogMAR (SD) | 0.56 (0.34) | 0.58 (0.39) | 0.13 |
| Ocular comorbidities (%) | |||
| Diabetic retinopathy | 177 (10.7) | 129 (9.8) | 0.43 |
| Glaucoma | 157 (9.5) | 139 (10.6) | 0.33 |
| Uveitis | 4 (0.2) | 5 (0.4) | 0.49 |
| Pupil <6 mm | 4 (0.2) | 3 (0.2) | 0.94 |
| Lens subluxation | 0 (0) | 1 (0.1) | 0.26 |
| Pseudoexfoliation | 8 (0.5) | 3 (0.2) | 0.26 |
| Prior vitrectomy | 1 (0.1) | 4 (0.3) | 0.11 |
| Ocular biometry (mm) | |||
| Axial length, mean (SD) | 23.29 (1.15) | 23.36 (1.01) | 0.46 |
| Anterior chamber depth, mean (SD) | 3.02 (0.41) | 3.02 (0.4) | 0.60 |
| Nuclear cataract grading† (%) | |||
| Grade 1 | 209 (12.9) | 127 (9.9) | 0.01 |
| Grade 2 | 988 (61.2) | 789 (61.4) | |
| Grade 3 | 387 (24) | 347 (27) | |
| Grade 4 | 30 (1.9) | 23 (1.8) |
*Data were unavailable in some cases due to incomplete medical records.
†Data were unavailable in some cases due to incomplete medical records and some patients had other types of cataract.
BCVA, best-corrected visual acuity.