Table 4.

Unadjusted kappa, adjusted kappa ‘PABAK’, prevalence and bias indices, and percent of positive and negative agreement

Instability categories	Unadjusted kappa	95% CI for unadjusted kappa	Percent agreement	PABAK adjusted kappa	Prevalence index	Bias index	Percent of positive agreement	Percent of negative agreement	n
Structural	0·19	− 0·21, 0·59	85%	0·70	0·80	0·1	92%	25%	33
Functional	0·72	0·36, 1·09	95%	0·90	0·80	0·0	75%	98%	3
Combined	0·84	0·55, 1·14	98%	0·95	0·83	0·3	86%	99%	3

PABAK: prevalence-adjusted, bias-adjusted kappa; n: number of participants in each category.