Cut-off points between pain intensities of the postoperative pain using receiver operating characteristic (ROC) curves

Table 2 The range of pain scores in the post-anesthesia care unit (PACU)

	4PS	VAS	NRS	FPS-R
First pain assessment	None (n = 23)	0 (0–1)	0 (0–1)	0 (0–2)
	Mild (n = 87)	4.5 (0–7.8)	5 (0–8)	4 (2–6)
	Moderate (n = 59)	6.2 (1.8–9.3)	7 (3–9)	6 (2–10)
	Severe (n = 11)	8.6 (6–10)	9 (5–10)	8 (4–10)
Second pain assessment	None (n = 22)	0 (0–1.5)	0 (0–1)	0 (0–2)
	Mild (n = 77)	4.2 (1.0–7.5)	4 (1–7)	4 (0–6)
	Moderate (n = 71)	6.8 (3.1–9.4)	7 (4–9)	6 (2–8)
	Severe (n = 9)	10 (5.7–10)	10 (7–10)	10 (4–10)
Combined	None	0 (0–1.5)	0 (0–1)	0 (0–2)
	Mild	4.5 (0–7.8)	5 (0–8)	4 (0–6)
	Moderate	6.5 (1.8–9.4)	7 (3–9)	6 (2–10)
	Severe	9.15 (5.7–10)	9 (5–10)	8 (4–10)

Data are expressed by the median value (minimum - maximum). First pain assessment was performed when the patients opened their eyes spontaneously or responded well to physicians’ verbal commands to say their name after arriving at the PACU. The second pain assessment was performed 30 min after arriving at the PACU. FPS-R faces pain scale-revised, NRS Numerical rating scale, PACU Post-anesthesia care unit, VAS Visual analog scale, 4PS Four-point scale

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