Table 6 Discrimination and difficulty abilities of M-BDDQ-AS

Q1

Discrimination

3.02–3.40

Difficulty

0.33–0.43

Q2

Discrimination

2.60–3.30

Difficulty

0.24–0.29

Q3

Discrimination

10.10–10.50

Difficulty

 ≥ 2

0.54–0.62

 ≥ 3

0.86–1.01

 ≥ 4

1.46–1.69

5

1.83–2.13

Q4

Discrimination

6.71–7.41

Difficulty

 ≥ 2

0.21–0.51

 ≥ 3

0.73–1.13

 ≥ 4

1.49–1.89

5

1.93–2.33

Q5

Discrimination

8.36–8.75

Difficulty

 ≥ 2

0.05–0.44

 ≥ 3

0.68–1.08

 ≥ 4

1.04–1.44

5

1.65–2.04

Q6

Discrimination

5.54–6.24

Difficulty

 ≥ 2

0.54–1.02

 ≥ 3

1.29–1.78

 ≥ 4

1.74–2.22

5

2.45–3.07

Q7

Discrimination

3.61–4.31

Difficulty

0.70–0.78