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. Author manuscript; available in PMC: 2012 Aug 1.
Published in final edited form as: J Consult Clin Psychol. 2011 Aug;79(4):509–514. doi: 10.1037/a0024259

Table 1.

Demographic characteristics of participants across four study groups created based on once-weekly frequency stipulations.

BED-ND
N=160
BED
N=296
BN
N=130
NBPO
N=489
Test Statistic P value Effect
size
Age, mean (SD) a 35.6 (12.6) 35.8 (12.2) 32.1 (10.5) 38.5 (12.3) F(3, 927)=9.22 <.001 .029
Female, No (%) 123 (76.9%) 262 (88.8%) 123 (95.3%) 418 (85.7%) χ2 (3, n=1072)=22.81 <.001 .146
Ethnicity, No (%) b
 Caucasian 128 (80.0%) 251 (85.4%) 97 (75.2%) 372 (76.4%) χ2 (3, n=1075)=10.07 .018 .097
 African-American 8 (5.0%) 8 (2.7%) 7 (5.4%) 51 (10.5%)
 Hispanic 9 (5.6%) 17 (5.8%) 17 (13.2%) 27 (5.5%)
 Asian 11 (6.9%) 11 (3.7%) 4 (3.1%) 13 (2.7%)
 Other 4 (2.5%) 7 (2.4%) 4 (3.1%) 24 (4.9%)

Note: BED-ND = binge eating disorder – no distress (i.e., no marked distress criterion); BED = binge eating disorder; BN = bulimia nervosa; NBPO = no-binge-eating/purging obese comparison group

a

Posthoc Scheffe test found that NBO significantly differs from BN and BED. There were no other group differences.

b

Specific group comparisons revealed a greater percentage of white participants in the BED group versus the BN and NBPO groups.