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Table 3 On the logit scale of Rasch model, the conversion from the correct items answered to the estimated ASD knowledge level (θ)

From: Autism spectrum disorder knowledge scale: Chinese revision of the general population version

Correct quantities of 30

Accuracy of 30 items (%)

Estimated ASD knowledge score(θ)

4

13.33

-2.660

5

16.67

-2.385

6

20.00

-2.144

7

23.33

-1.926

8

26.67

-1.725

9

30.00

-1.535

10

33.33

-1.355

11

36.67

-1.181

12

40.00

-1.012

13

43.33

-0.846

14

46.67

-0.682

15

50.00

-0.517

16

53.33

-0.352

17

56.67

-0.185

18

60.00

-0.014

19

63.33

0.161

20

66.67

0.342

21

70.00

0.533

22

73.33

0.735

23

76.67

0.951

24

80.00

1.186

25

83.33

1.446

26

86.67

1.742

27

90.00

2.090

28

93.33

2.526

  1. θ value is based on logit's estimation of accurate scale rather than strict ordinal value.