Table 2.

IQ scores of individuals with or without special areas of skill.

area of skill	group	N tested Wechsler FS IQa; mean (s.d.) [range]	N tested PIQ; mean (s.d.) [range]	N tested VIQ/IQ estimate; mean (s.d.) [range]
exceptional cognitive	skill	N=20; 89.4 (16.9) [64–130]	N=23; 96.7 (14.7) [76–135]	N=23; 77.4 (22.4) [14b–131]
	no skill	N=62; 73.7 (17.9) [39–126]	N=114; 64.4 (20.6) [28–133)	N=114; 47.9 (33.2) [7b–134]
parent-rated savant	skill	N=22; 88.1 (20.1) [63–130]	N=24; 86.4 (20.3) [53–135]	N=24; 84.7 (30.4) [15b–134]
	no skill	N=40; 74.9 (17.5) [44–124]	N=69; 69.1 (22.2) [29–122]	N=69; 50.1 (32.5) [7b–118]
savant and exceptional cognitive skill	skill	N=7; 95.4 (16.8) [76–130]	N=8; 96.0 (20.4) [76–135]	N=8; 90.4 (33.8) [16b–134]

^aFSIQ based on Wechsler tests only. PIQ and VIQ estimates are based on a number of different tests (see text) and include all participants with parental data.

^bLow verbal IQ scores based on ratio IQ estimate (language age/chronological age×100).