Table 1.

PRODIGY risk score for the risk of postoperative respiratory depression. From Khanna and colleagues with permission.¹³ The STOP-BANG acronym stands for snoring history, tired during the day, observed stop of breathing while sleeping, high blood pressure, body mass index >35 kg m⁻², age >50 yrs, neck circumference >40 cm and male sex. CHF, chronic heart failure; SDB, sleep-disordered breathing.

Risk factor	Scoring criteria	Points
Age (yrs)	<60	0
	60–69	8
	70–79	12
	≥80	16
Sex	Male	8
	Female	0
Previous opioid use	Opioid naive	3
	Previous opioid use	0
Sleep-disordered breathing	Known SDB or high STOP-BANG score	5
Chronic heart failure	No SDB or normal STOP-BANG score	0
	Coexisting CHF	7
	No known CHF	0
		Total score = ….
PRODIGY risk score	Low risk: <8 points
	Moderate risk; 8–14 points
	High risk: ≥15