Relation between credibility of website and accuracy of website's contents. Values are numbers (percentages) unless otherwise indicated


Feature of website credibility Levels of accuracy*
Rank correlation
I II III Kendall's tau b P value

Description of source:
Present (n=113) 27 (24) 42 (36) 44 (39) 0.15 0.48
Absent (n=8)  1 (12)  1 (12)  6 (76)
Description of currency:
Present (n=59) 20 (34) 19 (32) 20 (34) 0.21 0.05
Absent (n=62)  8 (13) 24 (39) 30 (48)
Description of an evidence hierarchy:
Present (n=22)  7 (32) 10 (45)  5 (23) 0.16 0.25
Absent (n=99) 21 (21) 33 (33) 45 (46)

* Level I: more than two thirds of guideline statements covered; level II: one third to two thirds of guideline statements covered; level III: less than one third of guideline statements covered.