Cognitive prerequisites for fitness to drive: Norm values for the TMT, UFOV and NorSDSA tests

Figures & data

Table 1. Results from spearman’s correlation test.

	UFOV 1	UFOV 2	UFOV 3	UFOV total	TMT A	TMT B	NorSDSA	Age
UFOV 1	1.00
UFOV 2	0.613	1.00
UFOV 3	0.377	0.586	1.00
UFOV, total	0.434	0.668	0.986	1.00
TMT A, time	0.365	0.436	0.571	0.579	1.00
TMT B, time	0.325	0.433	0.484	0.484	0.659	1.00
NorSDSA	−0.208	−0.358	−0.528	−0.530	−0.467	−0.512	1.00
Age	0.372	0.543	0.754	0.760	0.545	0.504	−0.502	1.00

Bold values >0.5 are accepted as moderate.

Table 2. Results from UFOV subtests and total score, TMT a and TMT B by age groups (mean, SD, median, percentiles).

	Age groups				P	H
	20–39 years (n = 107)	40–59 years (n = 139)	60–69 years (n = 89)	≥70 years (n = 75)
UFOV 1					0.001	14.4
Mean	15.69	15.88	15.88	25.27
SD	2.73	2.8	2.02	24.73
Median	14.8	14.8	15.7	16
10%–90%	14–18.2	14–19	14.8–17	14.8–50
UFOV 2					<0.001	37.6
Mean	17.45	20.72	35.62	95.06
SD	9.24	20.28	46.37	95.48
Median	14.9	15	18.3	61.5
10%–90%	14–23	14–27	14.8–66	16–248
UFOV 3					<0.001	119.4
Mean	40.25	64.16	124.67	238
SD	30.04	35.56	78.17	120.15
Median	31.8	55	103	220
10%–90%	15–63	24–112	51–220	96–399
UFOV, total					<0.001	120.7
Mean	73.35	100.77	177.39	358.33
SD	35.08	48.63	104.84	205.04
Median	64.5	92.4	138.4	305
10%–90%	44.5–107.2	56–151	80–299	140.7–701
TMT A, time					<0.001	37.3
Mean	23	26.4	32.3	39.6
SD	6.5	8.6	11.4	12.8
Median	22	25	29	37
10%–90%	15.4–32	17–37	21.6–50	26–60
TMT B, time					<0.001	32.2
Mean	55.2	57	75.1	97.9
SD	21.6	21.1	29.5	41.6
Median	52	55	70	90
10%–90%	35–82	36–85	45.5–118	53–141
NorSDSA, total score					<0.001	39.1
Mean	3.11	3.09	2.51	1.59
SD	0.74	0.62	0.76	1.09
Median	3.26	3.15	2.65	1.56
10%–90%	2.2–3.8	2.25–3.77	1.53–3.46	0.32–2.81

Table 3. Results from NorSDSA subtests by age groups (mean, SD, median, percentiles).

	Age groups				P	H
	20–39 years (n = 107)	40–59 years (n = 139)	60–69 years (n = 89)	≥70 (n = 75)
Dots, time^a					<0.001	39.3
Mean	321.5	341.2	387.1	414
SD	63.8	62	83.3	92.3
Median	311	335	381	395
10%–90%	256–404	274–429	294–481	310–549
Dots, misses^a					0.748	0.6
Mean	6.1	5.7	6.4	9.8
SD	5.5	5.4	6.4	8.7
Median	4	4	5	8
10%–90%	1–14	1–14	1–13	1–25
Direction, score					0.001	9.1
Mean	31.9	31.6	31.7	29.6
SD	0.5	1.1	1.2	4.8
Median	32	32	32	32
10%–90%	32–32	30–32	32–32	24–32
Direction, time					<0.001	23.2
Mean	111.8	119	151.2	207.3
SD	50.1	51.4	67.3	68.1
Median	97	103	134	200
10%–90%	67–183	65–189	81–274	118–300
Compass, score^a					<0.001	31.6
Mean	31.2	30.8	28.7	23.9
SD	3	2.7	4.5	6.2
Median	32	32	32	24
10%–90%	30–32	88–32	22–32	15–32
Compass, time					<0.001	65.5
Mean	209.5	245	270.3	291.1
SD	52.4	47.8	41.9	18.14
Median	199	248	300	300
10%–90%	145–300	180–300	208–300	258–300
Road signs, 3 min^a					<0.001	43.9
Mean	9.7	9.7	7.8	6.2
SD	2.1	2.7	2.2	2.3
Median	10	10	8	6
10%–90%	6–12	7–12	5–11	4–10
Road signs, 5 min					<0.001	27.7
Mean	10.5	10.8	9.7	7.7
SD	1.8	1.8	1.8	2.2
Median	11	11	10	7
10%–90%	9–12	8–12	7–12	5–11

Kruskal-Wallis H test.

^aVariables included in the formula for the NorSDSA total score.

Table 4. Correlation analysis for NorSDSA subtests, UFOV subtests and TMT a and B.

	UFOV 1	UFOV 2	UFOV 3	UFOV total	TMT A	TMT B
Dot cancelation, time^a	0.131	0.383	0.637	0.640	0.598	0.537
Dot cancelation, misses^a	0.014	0.176	0.141	0.168	0.181	0.226
Direction, score	0.074	−0.166	−0.274	−0.268	−0.150	−0.125
Direction, time	0.121	0.335	0.617	0.614	0.441	0.258
Compass, score^a	−0.089	−0.277	−0.471	−0.460	−0.363	−0.447
Compass, time	0.205	0.436	0.724	0.729	0.508	0.522
Road marks, 3 min^a	−0.039	−0.258	−0.462	−0.467	−0.399	−0.391
Road marks, 5 min	0.077	−0.109	−0.290	−0.295	−0.453	−0.434

Accepted level for moderate correlation, r_s > 0.5.

^aVariables included in the formula for the NorSDSA total score.