Table 8.

Predictive properties of the scales in the days prior to pressure ulcer formation

	Day 1			Day 2			Day 3
	SE	CJRS	BS	SE	CJRS	BS	SE	CJRS	BS
Precision	82.22	84.44	21.11	81.82	85.23	18.89	82.56	86.05	17.44
Coefficient phi	0.43	0.53	0.02	0.36	0.47	-0.12	0.35	0.47	0.08
Sensitivity	60.00	73.33	100.00	53.85	61.54	86.67	54.55	63.64	100.00
Specificity	86.67	86.67	5.33	86.67	89.33	5.33	86.67	89.33	5.33
Positive predictive value	47.37	52.38	17.44	41.18	50.00	15.48	37.50	46.67	13.41
Negative predictive value	91.55	94.20	100.00	91.55	93.06	66.67	92.86	94.37	100.00
Likelihood ratio (+)	4.50	5.50	1.06	4.04	5.77	1.06	4.09	5.97	1.06
Likelihood ratio (-)	0.46	0.31	0.00	0.53	0.43	0.00	0.52	0.41	0.00
Efficiency	73.33	80.00	52.67	70.26	75.44	46.00	70.61	76.48	52.67

SE - Sunderland Scale; CJRS - Cubbin & Jackson Revised Scale; BS - Braden Scale.