Table 3.

Mean-square fit statistics for all items in the A-PKQ child version.

	Outfit (MSQ) 1	Infit (MSQ)		Outfit (MSQ)	Infit (MSQ)
Gastrointestinal tract			Functional Abdominal Pain
gurgle	0.78	0.94	answer	0.76	0.95
stool color	0.58	0.88	influence	1.10	1.10
stool form	0.76	0.86	limitation	0.92	0.96
stress	0.94	0.96	soccer	0.98	0.97
statement	1.10	1.11	medication	0.92	0.95
Abdominal Pain			Handling FAP
perception	0.93	1.00	help	1.01	1.01
doctor	1.26	1.07	nutrition	0.68	0.88
types	0.89	0.93	warmth	1.98 *	1.06
obstipation	1.19	1.05	sleep	0.73	0.91
food poisoning	0.83	0.94	distraction	0.83	0.94

* Items that exceeded the cut-off for item fit (0.5–1.5). ¹ Mean-square fit statistics: measure the extent of distortion of the measuring system (1.0 is the expected value).