Web pages informing about probiotics, yoghurt, kefir, kombucha, fibre and prebiotics that meet each information quality criterion
| Quality criteria | All web pages (%) n=114 | Probiotics (%) n=19 | Yoghurt (%) n=17 | Kefir (%) n=20 | Kombucha (%) n=20 | Fibre (%) n=20 | Prebiotics (%) n=18 |
| 1. Provides references or links to scientific publications. | 45 (39.5) | 11 (57.9) | 5 (29.4) | 6 (30.0) | 5 (25.0) | 9 (45.0) | 9 (50.0) |
| 2. Explains conclusions of scientific publications. | 21 (18.4) | 5 (26.3) | 3 (17.7) | 4 (20.0) | 2 (10.0) | 4 (20.0) | 3 (16.7) |
| 3. Quantifies relative effects. | 9 (7.9) | 1 (5.3) | 1 (5.9) | 2 (10.0) | 1 (5.0) | 3 (15.0) | 2 (11.1) |
| 4. Quantifies absolute effects. | 2 (1.8) | 0 | 0 | 0 | 0 | 1 (5.0) | 1 (5.6) |
| 5. Acknowledges some research limitations. | 33 (28.9) | 8 (42.1) | 6 (35.3) | 3 (15.0) | 3 (15.0) | 6 (30.0) | 7 (38.9) |
| 6. Generally discusses certainty of evidence. | 18 (15.8) | 5 (5.9) | 1 (5.9) | 1 (5.0) | 4 (20.0) | 3 (15.0) | 4 (22.2) |
| 7. Reports potential harms. | 48 (42.1) | 5 (26.3) | 1 (5.9) | 12 (60.0) | 13 (65.0) | 11 (55.0) | 6 (33.3) |
| 8. Reports on available alternatives. | 49 (43.0) | 14 (73.7) | 8 (47.1) | 7 (35.0) | 1 (5.0) | 6 (30.0) | 13 (72.2) |
| 9. Discusses intervention costs. | 4 (3.5) | 2 (10.5) | 1 (5.9) | 0 | 1 (5.0) | 0 | 0 |
| 10. Does not argue based on personal experiences or anecdotes. | 113 (99.1) | 18 (94.7) | 17 (100.0) | 20 (100.0) | 18 (90.0) | 20 (100.0) | 20 (100.0) |