Standard setting made easy: validating the Equal Z-score (EZ) method for setting cut-score for clinical examinations

Shulruf, Boaz; Yang, Ying-Ying; Huang, Pin-Hsiang; Yang, Ling-Yu; Huang, Chin-Chou; Huang, Chia-Chang; Liu, Chih-Wei; Huang, Shiau-Shian; Chen, Chen-Huan; Lee, Fa-Yauh; Kao, Shou-Yen

doi:10.1186/s12909-020-02080-x

Table 1 Cut-score yielded from the Borderline Regression and the EZ Methods

From: Standard setting made easy: validating the Equal Z-score (EZ) method for setting cut-score for clinical examinations

	Borderline Regression Method (year 6)			Borderline Regression Method (year 7)			EZ Method day 1		EZ Method day 2		EZ Method day 3		EZ Method overall
	CS	95%CI		CS	95%CI		CS	Conf (%)	CS	Conf (%)	CS	Conf (%)	CS	Conf (%)
Station No.*		L	H		L	H
1–1	49.20	46.52	51.87	40.81	38.04	43.59	49.47	100.00	58.98	99.95	55.71	93.20	54.87	100.00
1–2	41.88	39.02	44.73	51.51	49.35	53.66	60.63	99.75	57.62	99.67	59.29	95.45	59.28	100.00
1–3	47.70	44.24	51.17	49.04	46.78	51.30	62.11	98.80	56.63	99.62	59.15	92.86	59.60	99.99
1–4	53.96	50.83	57.10	63.12	60.36	65.88	74.37	97.18	70.57	95.41	75.32	94.75	73.53	99.87
1–5	64.87	62.03	67.71	64.89	62.71	67.08	65.97	99.50	61.39	98.56	71.05	99.23	66.21	99.99
1–6	58.70	55.89	61.51	59.70	56.66	62.73	51.71	99.26	54.34	96.81	52.15	92.72	52.84	99.97
1–7	42.32	39.79	44.85	42.42	39.62	45.22	56.07	99.87	51.61	99.74	59.71	96.34	55.64	100.00
1–8	51.00	48.23	53.77	49.09	44.23	53.96	58.11	99.84	53.27	98.04	62.62	90.30	57.91	99.97
1–9	66.55	63.70	69.39	65.03	63.28	66.77	60.01	99.92	57.13	99.51	59.46	95.29	58.67	100.00
1–10	35.56	33.08	38.03	29.31	26.77	31.86	53.70	99.61	54.27	93.70	59.53	88.08	55.82	99.89
1–11	63.18	60.83	65.54	62.35	59.03	65.67	62.40	98.97	63.18	96.91	66.74	86.67	64.04	99.90
1–12	52.82	49.11	56.54	50.77	47.94	53.59	62.83	97.65	63.59	95.62	68.22	93.13	64.69	99.89
2–1	55.55	53.71	57.38	49.67	47.28	52.06	55.51	99.57	61.53	99.88	58.70	96.66	58.10	100.00
2–2	41.19	39.24	43.13	43.52	42.09	44.94	52.07	99.98	52.01	99.24	54.18	96.66	52.74	100.00
2–3	55.07	52.72	57.43	55.97	53.99	57.96	59.11	97.59	52.78	98.08	64.31	95.79	58.63	99.93
2–4	66.55	63.46	69.63	54.71	52.23	57.19	69.75	94.04	66.99	97.41	72.39	85.13	69.61	99.43
2–5	61.61	58.61	64.60	61.71	59.73	63.68	64.94	99.07	64.37	97.08	68.79	85.24	66.00	99.91
2–6	50.93	46.67	55.19	49.17	47.35	51.00	57.35	98.73	51.07	98.76	58.42	95.34	55.75	99.98
2–7	57.32	55.38	59.26	49.81	48.07	51.54	61.41	98.60	59.27	99.94	61.93	98.49	60.92	100.00
2–8	44.33	42.56	46.10	46.44	44.10	48.79	59.56	99.57	59.22	98.89	61.71	93.16	60.10	99.99
2–9	51.32	48.31	54.33	57.68	54.15	61.21	57.96	99.03	55.83	99.45	58.24	97.12	57.42	100.00
2–10	56.17	52.46	59.88	38.61	34.15	43.06	60.47	95.94	56.46	98.22	62.03	95.00	59.73	99.92
2–11	64.82	59.95	69.68	66.33	63.37	69.29	68.72	97.48	70.63	94.95	72.61	91.67	70.53	99.85
2–12	55.96	51.45	60.48	59.65	56.32	62.98	71.12	93.27	70.51	97.65	76.44	98.17	72.35	99.83

*Stations 1–1 to 1–12 were of first mock OSCE, stations 2–1 to 2–12 were of second mock OSCE. First six stations were round 1 and latter six ones were round 2 in each mock OSCE

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