Table A2.

Item Response Theory Item Parameters for the 39 PROMIS Pediatric Positive Affect Item Bank, Parent-Proxy Edition, and Short Form Item Assignment

	Short Forms		Item Discrimination (a)	Item Thresholds
Item stem	8-item	4-item		b1	b2	b3	b4
My child felt calm.	X		2.10	−3.98	−2.21	−0.77	0.94
My child felt peaceful.	X		2.87	−3.39	−2.14	−0.73	0.65
My child felt satisfied.			4.43	−2.93	−2.09	−0.92	0.53
My child felt content.			3.58	−3.09	−2.06	−0.96	0.56
My child felt grateful.			2.59	−3.05	−1.97	−0.76	0.57
My child felt thankful.			1.81	−3.47	−2.13	−0.81	0.77
My child felt positive.			3.70	−3.04	−2.20	−1.00	0.49
My child felt carefree.			2.49	−3.27	−1.89	−0.69	0.72
My child felt relaxed.			2.27	−3.59	−2.17	−0.72	0.93
My child felt comfortable.			2.96	−3.40	−2.35	−1.20	0.38
My child felt fulfilled.			3.89	−2.90	−1.99	−0.70	0.72
My child felt respected.			2.49	−4.25	−2.44	−0.99	0.48
My child felt appreciated.			2.36	−3.89	−2.60	−1.10	0.40
My child felt proud.			3.02	−3.57	−2.30	−0.99	0.50
My child had much to be proud about.			2.33	−4.37	−2.39	−1.00	0.51
My child felt pleased.			2.78	−3.73	−2.29	−0.85	0.80
My child felt great.	X	X	4.23	−2.92	−1.97	−0.88	0.53
My child felt cheerful.	X	X	4.69	−3.02	−2.17	−0.92	0.53
My child felt happy.	X	X	3.81	−2.88	−2.33	−1.23	0.46
My child had very strong happy feelings.			3.61	−2.91	−1.89	−0.75	0.64
My child felt joyful.	X	X	4.95	−2.80	−1.79	−0.74	0.56
My child felt delighted.			4.11	−2.88	−1.91	−0.69	0.61
My life was pleasurable.			4.05	−2.81	−2.01	−0.90	0.52
My child smiled a lot.			2.50	−3.45	−2.42	−1.19	0.41
My child laughed a lot.			2.57	−3.80	−2.19	−1.01	0.42
My child was merry.			2.73	−3.16	−1.97	−0.69	0.81
My child was in a good mood.			2.97	−3.60	−2.42	−1.14	0.73
My child was in good spirits.			3.04	−3.60	−2.42	−1.20	0.67
My child felt good.			2.86	−3.43	−2.44	−1.22	0.61
My child felt blissful.			3.21	−2.59	−1.67	−0.49	0.85
My child felt enthusiastic.			2.54	−3.60	−2.20	−0.82	0.63
My child felt energetic.			2.43	−3.67	−2.10	−0.77	0.56
My child had a lot of energy.			2.22	−3.32	−2.16	−0.81	0.51
My child felt wide awake.			1.60	−4.46	−2.65	−0.74	1.27
My child felt refreshed.	X		3.02	−3.03	−2.02	−0.56	0.94
My child felt active.			1.89	−3.90	−2.38	−0.98	0.44
My child felt full of pep.			2.54	−3.17	−1.93	−0.69	0.73
My child felt strong.			2.45	−3.63	−2.44	−1.07	0.54
My child felt healthy.			1.87	−3.82	−2.62	−1.19	0.37