Table 2.
Percentage of regression trees in which each variable is included.
| Variables | Percentage of Models |
|---|---|
| Occupational seniority (years) | 97.20% |
| Use of VDT at work (hours per day) | 96.90% |
| Hospital units’ seniority (years) | 96.30% |
| Past history of conjunctivitis | 88.50% |
| Current use of eye drops | 79.80% |
| Rotating Shifts (including nights) | 74.60% |
| Refractive surgery | 74.20% |
| Time as VDT worker (>2 years) | 74.10% |
| Ocular surgery | 69.40% |
| Ophthalmic lens wearers | 64.10% |
| Geriatric department | 60.70% |
| Use of VDT outside work (hours per day) | 60.60% |
| Total VDT use (hours per day) | 60.10% |
| Morning shifts plus on-call | 57.20% |
| Sterilization unit | 53.40% |
| Contact lens wearers | 50.30% |
| Surgery unit | 48.60% |
| Past history of ocular herpes | 46.10% |
| Age | 42.40% |
| Blood bank department | 41.10% |
| Anatomical pathology department | 40.90% |
| Endocrinology unit | 40.70% |
| Morning shifts | 40.50% |
| Sex | 40.20% |
| Traumatology unit | 39.90% |
| Nephrology unit | 39.70% |
| Easy software application | 39.60% |
| Past history of keratitis | 39.30% |
| Anesthesiology department | 34.60% |
| Evening shifts | 34.20% |