Table 3.

Sensitivity and specificity values of the National Early Warning Score 2

	Derivation cohort, April 2015 – March 2017		Validation cohort, April 2017 – March 2019
	Sensitivity	Specificity	Sensitivity	Specificity
Cut point ≥5
NEWS2 in total respiratory population	0.87	0.72	0.88	0.69
NEWS2 in COPD (Scale 2)	0.77	0.77	0.81	0.79
Cut point ≥5 or any single vital sign score of 3
NEWS2 in total respiratory population	0.89	0.67	0.89	0.64
NEWS2 in COPD (Scale 2)	0.81	0.74	0.85	0.76
Cut point ≥7
NEWS2 in total respiratory population	0.68	0.90	0.70	0.88
NEWS2 in COPD (Scale2)	0.53	0.93	0.57	0.94

COPD = chronic obstructive pulmonary disease; NEWS2 = National Early Warning Score 2.