Comparison of the diagnostic performance of the Swischuk line method and the anterior atlantodental interval method in atlantodental subluxation

Table 2 The diagnostic performance of the AADI method (AADI) and the Swischuk line method (SL) in flexion and neutral posture of three readers

	Posture	Method	Post-hoc power	Cut-off value	Control group	AAS group	P value	Sensitivity (%)	Specificity (%)	PPV (%)		NPV (%)		Accuracy (%)
R1	Flexion	AADI	Not available due to AUC = 1	< 3 mm > 3 mm	32 0	2 30	< 0.001	93.75	100	100		94.12		96.88
		SL	1	< 1 mm > 1 mm	32 0	7 25	< 0.001	78.13	100	100		82.05		89.06
		SL	1	< 2 mm > 2 mm	32 0	17 15	< 0.001	46.88	100	100		65.31		73.44
	Neutral	AADI	1	< 3 mm > 3 mm	32 0	11 21	< 0.001	65.63	100	100		74.42		82.81
		SL	0.999	< 1 mm > 1 mm	32 0	12 20	< 0.001	62.50	100	100		72.73		81.25
		SL	0.999	< 2 mm > 2 mm	32 0	23 9	< 0.001	28.13	100	100		58.18		64.02
R2	Flexion	AADI	1	< 3 mm > 3 mm	31 1	1 31	< 0.001	96.88	96.88	96.88		96.88		96.88
		SL	1	< 1 mm > 1 mm	32 7	7 25	< 0.001	75.00	100	100		80		87.5
				< 2 mm > 2 mm	32	20	< 0.001	37.50	100	100		61.54		68.75
				< 2 mm > 2 mm	0	12	< 0.001	37.50	100	100		61.54		68.75
	Neutral	AADI	1	< 3 mm > 3 mm	32 0	12 20	< 0.001	62.50	100	100		72.73		81.25
		SL	0.982	< 1 mm > 1 mm	30 2	14 18	< 0.001	56.25	93.75	90		68.18		75
		SL	0.982	< 2 mm > 2 mm	32 0	24 8	< 0.001	25.00	100	100		57.14		62.50
R3	Flexion	AADI	1	< 3 mm > 3 mm	29 12	3 20	< 0.001	62.5	90.63	86.96		7.73		76.56
		SL	1	< 1 mm > 1 mm	32 0	8 24	< 0.001	75.00	100	100		80.00		87.50
		SL	1	< 2 mm > 2 mm	32 0	19 13	< 0.001	40.63	100	100		62.75		70.31
	Neutral	AADI	0.999	< 3 mm > 3 mm	32 0	21 11	< 0.001	34.38	100	100		60.38		67.19
		SL	0.975	< 1 mm > 1 mm	30 2	14 18	< 0.001	56.25	93.75	90		68.18		75
		SL	0.975	< 2 mm > 2 mm	32 0	25 7	0.005	21.88	100	100	56.14		60.94

Note: PPV = positive predictive value, NPV = negative predictive value, R1 = reader 1, R2 = reader 2, R3 = reader 3, AADI = AADI method, SL = Swischuk line method

ISSN: 1471-2342