Table 1.

Derivation of the delirium susceptibility score using systematically reviewed pooled data reported in the UK-NICE guidelines

Factor reported in NICE guideline [1]	Strength of reported association OR, 95% CI	Routinely available data used in the risk score	Allocated weight
Dementia/cognitive impairment	6.3, 2.9–13.7	Known diagnosis of dementia and or cognitive score below cut-off (AMTS < 9 or MMSE < 24)	2
Age ≥80 years	5.2, 2.6–10.4	Age	2
Severe illness	3.5, 1.5–8.2	Systemic inflammatory response syndrome (SIRS) positive1	1
Infection	3.0, 1.4–6.2	Working diagnosis of infection	1
Vision impairment	1.7, 1.0–2.9	History of poor vision in the care record or clinically overt poor vision	1

¹SIRS was classed as positive if 2 or more of the following were present: heart rate >90 beats per minute, temperature <36°C or >38°C, respiratory rate >20 breaths per minute, white blood cell count <4 × 10⁹ or >12 × 10⁹ cells per litre [17].