Study factors by case/control status
| Study factor | No of controls | No of cases | Total no of patients (%) |
|---|---|---|---|
| Age (years): | |||
| 40–50 | 15 | 8 | 23 (11.5) |
| 51–60 | 19 | 11 | 30 (15.0) |
| 61–70 | 38 | 26 | 64 (32.0) |
| 71–80 | 26 | 41 | 67 (33.5) |
| 81–90 | 2 | 13 | 15 (7.5) |
| 91 + | 0 | 1 | 1 (0.50) |
| Sex: | |||
| Male | 47 | 58 | 105 (52.5) |
| Female | 53 | 42 | 95 (47.5) |
| Ethnic origin: | |||
| White (British) | 77 | 45 | 122 (61) |
| African Carribean | 8 | 19 | 27 (13.5) |
| Asian | 9 | 9 | 18 (9) |
| White (other European) | 2 | 6 | 8 (4) |
| Not ascertained | 4 | 21 | 25 (12.5) |
| Referral source: | |||
| Optometrist with correct diagnosis | 85 | 51 | 136 (68) |
| Other | 15 | 49 | 64 (32) |
| Presenting IOP (mm Hg): | |||
| >31 | 26 | 57 | 83 (41.5) |
| 26–30 | 31 | 25 | 56 (28) |
| 21–25 | 34 | 13 | 47 (23.5) |
| <21 | 9 | 5 | 14 (7) |
| Glaucoma diagnosis: | |||
| POAG | 84 | 72 | 156 (78) |
| PXF | 2 | 10 | 12 (6) |
| Chronic angle closure | 6 | 12 | 18 (9) |
| Normal tension | 7 | 5 | 12 (6) |
| Other | 1 | 1 | 2 (1) |
| Ocular pathology: | |||
| Not significant | 91 | 75 | 166 (83) |
| Cataract | 3 | 15 | 18 (9) |
| AMD | 3 | 3 | 6 (3) |
| CRVO/BRVO | 3 | 1 | 4 (2) |
| Corneal problem | 0 | 4 | 4 (2) |
| Uniocular/amblyopic | 2 | 0 | 2 (1) |
| Systemic disease: | |||
| Generally in good health | 60 | 59 | 119 (59.5) |
| Hypertension | 23 | 29 | 52 (26) |
| Diabetes | 6 | 5 | 11 (5.5) |
| Other chronic diseases | 8 | 5 | 13 (6.5) |
| Hypertension and diabetes | 3 | 2 | 5 (2.5) |
| Family history: | |||
| Nil | 67 | 75 | 142 (71) |
| Glaucoma in 1st or 2nd degree relative | 33 | 25 | 58 (29) |