When there is a high test-retest correlation for the construct being measured what can be concluded?

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Page 2

	Belgium	Greece	Hungary	Netherlands	Norway	Spain
TEST-RETEST RELIABILITY STUDY*
No. in reliability study	118	155	132	137	102	86
Age, years (mean (sd))	11.4 (.6)	11.6 (.6)	12.5 (.6)	11.8 (.7)	11.4 (.6)	11.3 (.5)
Male gender (%)	44	52	50	53	42	44
Native language at home
Native	116	151	128	130	92	76
Non-native	2	4	1	7	10	9
Family status
Traditional (mother and father)	99	125	88	104	85	71
Non-traditional	19	28	44	33	15	14
CONSTRUCT VALIDITY STUDY**
No. in validity study	15	16	15	20	15	15
Age, years (mean (sd))	11.4 (.6)	11.5 (.6)	12.0 (.6)	11.7 (.7)	11.6 (.8)	11.6 (.8)
Male gender (%)	33	69	40	50	53	47
Native language at home
Native	13	16	15	20	13	15
Non-native	1	0	0	0	2	0
Family status
Traditional (mother and father)	12	14	11	13	10	13
Non-traditional	3	2	4	7	5	2

* Missing data test-retest reliability study: native language at home: n = 4 (Hungary: n = 3; Spain: n = 1); family status n = 3 (Norway: n = 2; Spain: n = 1)
** Missing data construct validity study: native language at home: n = 1 (Belgium: n = 1)