Table 3.

Percentiles (10, 50, and 90) by age for the Psychology Experiment Building Language Trail Making Test for the time (seconds) to complete Part A and Part B and the B to A ratio

		Part A	Part B	B:A
Age	N	10 (50) 90	10 (50) 90	10 (50) 90
5–6	20	169.7 (265.0) 448.8	182.2 (447.0) 617.4	1.00 (1.68) 2.61
7	27	126.5 (166.4) 240.1	203.6 (284.5) 443.1	1.21 (1.64) 2.50
8	17	102.1 (138.5) 294.8	141.9 (237.2) 394.2	1.17 (1.47) 1.93
9	27	90.5 (116.5) 174.8	129.6 (183.3) 306.9	1.24 (1.50) 2.34
10	29	83.4 (113.9) 150.6	121.7 (167.8) 249.3	1.18 (1.51) 1.86
11	26	76.2 (100.0 127.4	103.1 (141.5) 200.4	1.05 (1.44) 1.93
12	20	63.0 (92.4) 129.3	78.3 (122.5) 167.8	1.08 (1.32) 1.65
13–14	38	66.7 (83.4) 107.9	93.1 (116.9) 169.5	1.22 (1.44) 1.69
15–19	46	58.8 (77.5) 99.4	69.9 (100.3) 147.2	1.09 (1.29) 1.61
20–29	22	63.5 (73.9) 112.0	79.2 (97.3) 162.5	1.20 (1.33) 1.69
30–39	30	68.5 (83.4) 104.4	81.9 (109.2) 168.1	1.14 (1.34) 1.69
40–49	43	68.2 (84.1) 114.6	87.9 (115.3) 168.3	1.15 (1.45) 1.63
50–59	13	82.4 (93.8) 119.5	99.4 (128.6) 161.0	1.14 (1.29) 1.68
60–76	26	91.0 (114.2) 180.6	116.8 (172.7) 239.6	1.02 (1.38) 1.91