Table 1.

Sample descriptive for age groups and the total sample

Age group (years)	N	Age mean years (SD)	Females n (%)	RD mean (SD)	NS mean (SD)	Education mean (SD)	MMSE mean (SD)	FIQ mean (SD)	BDI mean (SD)	Alcohol mean (SD)
20–29	48	23.9 ± 2.5	25 ± 52	0.69 ± 0.13	0.57 ± 0.15	15.5 ± 1.9a	n.a.	112.9 ± 7.0	3.5 ± 3.2	4.2 ± 4.1
30–39	32	34.8 ± 2.8	20 ± 63	0.66 ± 0.16	0.48 ± 0.16	17.2 ± 2.4	29.4 ± 0.7	115.6 ± 8.2	3.7 ± 3.7	3.5 ± 3.7
40–49	32	45.1 ± 3.1	20 ± 63	0.61 ± 0.18	0.50 ± 0.18	15.4 ± 2.1	29.4 ± 0.6	115.6 ± 7.4	3.6 ± 4.2	3.7 ± 2.6
50–59	67	54.2 ± 2.7	39 ± 58	0.60 ± 0.18	0.49 ± 0.14	15.3 ± 2.2	29.2 ± 0.8	113.5 ± 7.2	4.1 ± 3.2	5.3 ± 3.8
60–69	46	64.1 ± 2.8	28 ± 61	0.61 ± 0.18	0.48 ± 0.14	16.3 ± 3.4	29.2 ± 0.7	113.7 ± 10.8	4.7 ± 3.9	4.7 ± 4.8
70–79	27	72.7 ± 2.4	14 ± 52	0.60 ± 0.12	0.41 ± 0.11	15.7 ± 3.1	28.8 ± 1.2	117.7 ± 11.0	5.9 ± 4.3	6.1 ± 5.9
80–89	11	81.9 ± 1.7	4 ± 36	0.55 ± 0.16	0.27 ± 0.09	15.1 ± 2.5	28.5 ± 0.8	121.6 ± 11.7	6.9 ± 4.4	5.2 ± 3.7
Total	263	50.0 ± 17.3	150 ± 57	0.63 ± 0.17	0.48 ± 0.16	15.7 ± 2.6	29.2 ± 0.8b	114.7 ± 8.8	4.4 ± 3.8c	4.7 ± 4.2d

Note: RD and NS are TCI mean scale scores between 0 (true) and 1 (false). MMSE: Mini Mental Stale Examination. n.a., not applicable.

^aMany subjects in the 20–30 years group were still attending college or university at the time of assessment. Completed years of education at the time of assessment are used in the present study.

^bMMSE not available for participants below 30 years of age. In total, MMSE scores were available for 210 of 215 subjects above 30 years of age.

^cBDI scores were available for 260 participants.

^dWeekly alcohol consumption (in standard units) was available for 253 participants.