Table 5: Proportion of advertisement claims
supported or not supported by different kinds of evidence, distinguished by
year.
Supported by |
2000 (n = 1518) |
2004 (n = 1494) |
2008 (n = 785) |
All years (n = 3797) |
High-quality evidence |
9% |
15% |
37% |
17% |
Low-quality evidence |
3% |
5% |
4% |
4% |
Experts’ opinion |
7% |
3% |
2% |
4% |
Reference not available |
15% |
27% |
11% |
19% |
Not supported by stated evidence |
9% |
5% |
5% |
6% |
No evidence stated |
57% |
46% |
42% |
49% |