Table 2.

The discrimination index (d) and difficulty index (p) values of the TSCT

Critical thinking skills construct	Selected item	Discrimination index (d)	Difficulty index (p)
Comparing and contrasting	CC2	0.63	0.56
	CC7	0.63	0.56
	CC8	0.63	0.56
	CC9	0.25	0.33
	CC10	0.38	0.56
	CC13	0.25	0.33
	CC15	0.63	0.43
	CC17	0.25	0.50
	CC18	0.63	0.56
	CC19	0.63	0.56
Sequencing	S2	0.38	0.56
	S3	0.63	0.56
	S4	0.38	0.56
	S5	0.63	0.43
	S6	0.25	0.50
	S8	0.38	0.56
	S10	0.63	0.56
	S11	0.25	0.38
	S14	0.38	0.56
	S18	0.63	0.56
Identifying cause and effect	CE1	0.60	0.43
	CE2	0.75	0.50
	CE4	0.50	0.50
	CE6	0.25	0.50
	CE7	0.75	0.50
	CE8	1.00	0.50
	CE11	0.87	0.56
	CE12	0.25	0.37
	CE14	0.25	0.50
	CE18	0.75	0.50

CC Comparing and contrasting, S sequencing, CE cause and effect