Item response modeling: a psychometric assessment of the children’s fruit, vegetable, water, and physical activity self-efficacy scales among Chinese children

Table 4 Wright map of item thresholds for FSE, VSE, WSE, and PASE

Logit	Latent Ability Distribution				Item Distribution				Item Threshold Distribution
	Fruit	Vegetable	Water	Physical activity	Fruit	Vegetable	Water	Physical activity	Fruit	Vegetable	Water	Physical activity
	Extremely high self-efficacy								Extremely difficult to endorse response
5
4				X
			X	X
			X	X
			X	XX
			XX	X								2.2
3		X	XX	X
		X	XX	X
	X	XX	XXXX	X					1.2			1.2 12.2
	XX	X	XXX	XX							4.2	4.2 11.2
2	X	XX	XXXX	XX								10.2
	XX	XXX	XXXX	XX					10.1			5.2 7.2 8.2
	XXX	XXX	XXXX	XXX						4.2	3.2	3.2 6.2 9.2
	XXX	XX	XXXX	XXX						6.2
	XXXX	XXXX	XXXX	XXX	11 12				11.1 12.1	3.2 5.2
1	XXXXX	XXXXX	XXXXX	XXXX					2.2	2.2 7.2 8.2	1.2
	XXXXXX	XXXXX	XXXXXX	XXXXX				6 11	3.2 4.1	1.2	2.2 5.2
	XXXXXXX	XXXXX	XXXXXX	XXXX	10	6		7 8 10	7.2
	XXXXXXX	XXXXXX	XXXXXX	XXXXXX		2 4 7	3 4 5	9	5.1 6.2 8.2 9.2
0	XXXXXXXXXX	XXXXXXXX	XXXXX	XXXXXX	3 4	3		4
	XXXXXXXX	XXXXXXXX	XXXXX	XXXXXXX	1 2 6	8	1	5	5.2 6.1 8.1 9.1
	XXXXXX	XXXXX	XXXX	XXXX	5 8 9	5	2	2 3 12	7.1
	XXXXXX	XXXXX	XXX	XXXXX	7				3.1 4.2	1.1	2.1 5.1
	XXXXX	XXXXX	XXX	XXXX		1			2.1	2.1 7.1 8.1	1.1
-1	XXX	XXXX	XX	XXXX					11.2 12.2	3.1 5.1
	XXX	XXX	X	XXX						6.1
	XX	XX	X	XX				1		4.1	3.1	3.1 6.1 9.1
	XX	XX	X	X					10.2			5.1 7.1 8.1
-2	X	X		X								10.1
	X	X	X	X							4.1	4.1 11.1
		X							1.1			1.1 12.1
		X		X
-3		X		X
												2.1
				X
-4
	Extremely low self-efficacy								Extremely easy to endorse response

On the left side of figure, the participants’ self-efficacy estimates were placed on the map with “X” following the outermost left column of logit scale.
“X” indicated the trait estimates of persons. Each ‘X’ represents 8.1 cases. Higher self-efficacies were placed at the top of the column, while, the lower self-efficacies were located at the bottom of the column
Item and threshold difficulties were presented on the right side of figure, with the top locations indicating the more difficult to endorse responses

ISSN: 1479-5868