In the third instalment of our series about evidence-based medicine,1 the source of the qualitative classification of kappa shown in Table 1 was incorrectly cited. The correct reference is Sackett DL, Haynes RB, Guyatt GH, Tugwell P. Clinical epidemiology: a basic science for clinical medicine. 2nd ed. Boston: Little, Brown and Co; 1991. p. 30.
Reference
- 1.↵