Examination of instruments used to rate quality of health information on the internet: chronicle of a voyage with an unclear destination.
OBJECTIVE
This study updates work published in 1998, which found that of 47 rating instruments appearing on websites offering health information, 14 described how they were developed, five provided instructions for use, and none reported the interobserver reliability and construct validity of the measurements.


METHODS
All rating instrument sites noted in the original study were visited to ascertain whether they were still operating. New rating instruments were identified by duplicating and enhancing the comprehensive search of the internet and the medical and information science literature used in the previous study. Eligible instruments were evaluated as in the original study.


RESULTS
98 instruments used to assess the quality of websites in the past five years were identified. Many of the rating instruments identified in the original study were no longer available. Of 51 newly identified rating instruments, only five provided some information by which they could be evaluated. As with the six sites identified in the original study that remained available, none of these five instruments seemed to have been validated.


CONCLUSIONS
Many incompletely developed rating instruments continue to appear on websites providing health information, even when the organisations that gave rise to those instruments no longer exist. Many researchers, organisations, and website developers are exploring alternative ways of helping people to find and use high quality information available on the internet. Whether they are needed or sustainable and whether they make a difference remain to be shown.
Gagliardi
Anna
A
Centre for Global eHealth Innovation, University Health Network, Toronto General Hospital, Fraser Elliott Building, Toronto, ON M5G 2C4, Canada.
Jadad
Alejandro R
AR
D005069:Evaluation Studies as Topic; D006266:Health Education / Q000592:standards; D006801:Humans; D007255:Information Services / Q000592:standards*; D020407:Internet / Q000592:standards*; D015588:Observer Variation; D011786:Quality Control; D015203:Reproducibility of Results