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. Author manuscript; available in PMC: 2014 Jul 30.
Published in final edited form as: J Psychiatr Res. 2013 Apr 6;47(7):872–879. doi: 10.1016/j.jpsychires.2013.03.010

Table 2.

Basic demographics are presented for the 94 healthy volunteers included in this study according to acquisition site.

Site N Gender Ethnicity Age WRAT Score Parental SES Handedness
Female White Mean SD Mean SD Mean SD Mean SD
N % N %
UI 51 23 45.1 48 94.1 30.92a 10.51 50.20 4.24 2.84c 0.42 0.92 3.04
MGH 17 9 52.9 11 64.7* 39.65a 9.27 51.47 4.32 3.00b 1.06 1.41 3.36
UMN 14 5 35.7 14 100 34.93 12.17 50.79 4.54 2.57 0.76 0.50 0.86
UNM 12 3 25 11 91.7 33.92 13.26 51.42 3.66 1.92b,c 0.67 1.92 3.06
Total 94 40 42.6 84 89.4 33.48 11.25 50.67 4.20 2.71 0.73 1.07 2.88

Abbreviations: WRAT, Wide Range Achievement Test; SES, Socioeconomic Status; Handedness, Annett Handedness Scale; UI, University of Iowa; MGH, Massachusetts General Hospital; UMN, University of Minnesota; UNM, University of New Mexico.

One way ANOVA and when appropriate Tamhane post hoc tests were performed to detect significant differences in Age, WRAT Score, Parental SES and Handedness between acquisition sites. Chi-square statistics (Fisher’s exact test in cases of small sample sizes) were performed to detect significant relationships between acquisition site and gender as well as between acquisition site and ethnicity; * – p < 0.05;

a

– participants from MGH had a significantly higher age than those from UI (p = 0.017);

b

– participants from MGH had significantly higher parental SES than those from UNM (p = 0.014);

c

– participants from UI had significantly higher parental SES than those from UNM (p = 0.003).