Validation and psychometric properties of the Somatic and Psychological HEalth REport (SPHERE) in a young Australian-based population sample using non-parametric item response theory

Table 1 Demographics of the full samples and sub-samples pruned for relatedness and/or longitudinal observations

Wave	N	Mean age	SD	Age range	% Females
TW1	1695	12.64	1.33	9–18	51%
TW1 pruned for relatedness	651	12.63	1.34	10–19	51%
TW2	1265	14.03	0.68	9–18	50%
TW2 pruned	602	14.02	0.68	10–18	50%
TM	1513	16.49	0.84	15–22	54%
TM pruned	683	16.48	0.83	16–22	53%
TA	1213	18.06	3.07	11–28	56%
TA pruned	592	18.27	3.13	12–26	56%
TA + TM pruned –one assessment wave/ individual	1117				55%
TA subset	543	18.67	3.02	12–26	56%
TM subset	574	16.42	0.78	16–22	54%
TA + TW2 pruned	1012				52%
TA subset	506	18.93	2.98	12–26	56%
TW2 subset	506	14.10	0.52	10–16	47%
TA + TW1 pruned	1149				53%
TA subset	585	18.39	3.12	12–26	55%
TW1 subset	564	12.50	1.15	10–19	50%

ISSN: 1471-244X