Table 5 DIF analysis

4

χ² = 0.91; P = 0.34

χ² = 0.02; P = 0.88

χ² = 0.12; P = 0.73

8

χ² = 0.44; P = 0.51

χ² = 1.12; P = 0.29

χ² = 0.25; P = 0.62

13

χ² = 4.35; P = 0.04

χ² = 1.12; P = 0.29

χ² = 0.84; P = 0.36

15

χ² = 0.11; P = 0.73

χ² = 4.78; P = 0.03

χ² = 2.64; P = 0.10

16

χ² = 1.89; P = 0.17

χ² = 0.03; P = 0.86

χ² = 3.11; P = 0.08

19

χ² = 2.26; P = 0.13

χ² = 1.27; P = 0.26

χ² = 0.41; P = 0.52

26

χ² = 1.79; P = 0.18

χ² = 0.73; P = 0.39

χ² = 3.12; P = 0.08

27

χ² = 3.17; P = 0.08

χ² = 5.67; P = 0.02

χ² = 1.09; P = 0.30

28

χ² = 0.83; P = 0.36

χ² = 5.41; P = 0.02

χ² = 0.00; P = 1

29

χ² = 0.02; P = 0.90

χ² = 1.20; P = 0.27

χ² = 2.00; P = 0.16

30

χ² = 7.11; P = 0.01

χ² = 0.25; P = 0.62

χ² = 0.82; P = 0.37

31

χ² = 7.27; P = 0.01

χ² = 0.04; P = 0.84

χ² = 0.24; P = 0.63

32

χ² = 0.66; P = 0.42

χ² = 1.93; P = 0.16

χ² = 5.07; P = 0.02

33

χ² = 2.02; P = 0.16

χ² = 0.45; P = 0.50

χ² = 0.72 P = 0.40

34

χ² = 1.51; P = 0.22

χ² = 3.67; P = 0.06

χ² = 2.85; P = 0.09