Table 1 Beliefs about clinical benefit and evidence of effectiveness over 2000–2003.
Threshold of clinical benefit that would make offering PDT as a treatment worthwhile | Survey year | ||||
|---|---|---|---|---|---|
| Â | Â | 2000 | 2001 | 2002 | 2003 |
To prevent the loss of 3 lines of visual acuity over 2 years | At least In 1 person for every 7 treated | 22 (19%) | 31 (27%) | 30 (28%) | 36 (37%) |
| Â | In 1 person for every 4 treated | 35 (30%) | 37 (32%) | 38 (35%) | 34 (35%) |
| Â | In 1 person for every 2 treated | 21 (18%) | 27 (23%) | 20 (19%) | 16 (17%) |
Further evidence of effectiveness required | 39 (33%) | 20 (19%) | 20 (17%) | 11 (11%) | |
Total | 117 | 108 | 115 | 97 | |