Table 1.

Average difficulty and discrimination coefficients per number of time questions were used

	Average difficulty (standard deviation)			Average discrimination (standard deviation)
Number of uses	2	3	4	2	3	4
N	1,182	364	83	1,102	349	80
1st use	80.18 (17.69)	79.13 (16.85)	78.06 (18.30)	0.173 (0.114)	0.165 (0.115)	0.184 (0.104)
2nd use	81.69 (17.13)	83.80 (16.18)	80.18 (18.82)	0.171 (0.114)	0.141 (0.111)	0.149 (0.115)
3rd use		84.48 (15.94)	84.31 (14.25)		0.135 (0.107)	0.149 (0.126)
4th use			84.92 (14.77)			0.140 (0.115)
p value	<0.0001	<0.0001	<0.0001	0.227	<0.0001	0.004