Table 2 Test–retest reliability, internal consistency, and scale descriptions

Dimensions	Number of items	Test–retest reliability ICC	Internal consistency reliability Cronbach’s alpha	Number of responders	% Missing	% Floor	% Ceiling
Children		n = 259	n = 1058
Total	52			1274
Physical Well-being	5	0.73	0.85	1260	1.1	0.1	19.7
Psychological Well-being	6	0.74	0.93	1267	0.5	0.2	24.7
Moods & Emotions	7	0.66	0.88	1264	0.8	0.4	14.4
Self-Perception	5	0.67	0.68	1255	1.5	0.1	8.3
Autonomy	5	0.66	0.82	1267	0.5	0.2	12.6
Parent Relations & Home Life	6	0.87	0.92	1260	1.1	0.2	24.5
Financial Resources	3	0.65	0.89	1210	5.0	7.4	23.8
Social Support & Peers	6	0.76	0.89	1270	0.3	0.2	25.0
School Environment	6	0.80	0.91	1255	1.5	0.2	17.5
Social Acceptance (Bullying)	3	0.61	0.77	1255	1.5	1.0	43.5
Parents		n = 244	n = 880
Total	52			982
Physical Well-being	5	0.70	0.89	946	3.7	0.0	14.5
Psychological Well-being	6	0.72	0.94	976	0.6	0.0	11.9
Moods & Emotions	7	0.71	0.89	978	0.4	0.1	7.4
Self-Perception	5	0.71	0.71	966	1.6	0.0	4.6
Autonomy	5	0.67	0.85	974	0.8	0.0	6.2
Parent Relations & Home Life	6	0.70	0.90	973	0.9	0.1	6.0
Financial Resources	3	0.67	0.92	952	3.1	7.4	15.3
Social Support & Peers	6	0.69	0.92	961	2.1	0.3	13.5
School Environment	6	0.75	0.90	965	1.7	0.0	8.5
Social Acceptance (Bullying)	3	0.56	0.85	973	0.9	0.2	42.8

ICC intraclass correlation coefficient, % Missing percentage of values which were missing, % Floor / % Ceiling percentage of scores at the extremes of the scale range

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