Table 2. Exact agreement and rank correlation for all raters and for raters according to specialty.

Value	All raters	Surgeons	Geriatricians	p value
	n = 41	n = 32	n = 9
Fleiss' kappa (κ)	0.471	0.491	0.390	0.0452
Kendall's W	0.847	0.850	0.847	0.909
Kendall's tau (τ)	0.797	0.801	0.782	0.333

Fleiss' kappa: exact inter-rater agreement; Kendall's W: relative agreement among raters; Kendall's tau: relative agreement with a standard value