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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 2.

Comparison 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)
ANOVA Covary for BDI Covary
for
BMI
Covary
for
age,
sex,
race

M sd M sd M sd M sd F η 2 posthoc F η 2 posthoc η 2 η 2
BMI 31.8 (9.0) 34.3 (10.0) 29.8 (9.2) 37.8 (6.8) 43.00 .108 acdef 49.05 .135 bcdef .089
EDE-Q
Restraint
1.8 (1.3) 2.5 (1.6) 3.8 (1.5) 2.1 (1.5) 54.61 .133 abdef 37.70 .107 abdef .120 .121
EDE-Q Eating
Concern
1.8 (1.2) 3.2 (1.4) 4.0 (1.4) 1.5 (1.2) 195.67 .355 abdef 123.15 .281 ALL .361 .330
EDE-Q Shape
Concern
3.7 (1.4) 4.9 (1.0) 5.3 (0.8) 4.0 (1.4) 70.15 .168 abdef 32.12 .093 abef .179 .143
EDE-Q Weight
Concern
3.2 (1.3) 4.3 (1.1) 4.7 (0.9) 3.4 (1.3) 75.49 .178 abdef 33.56 .096 abef .197 .151
EDE-Q Global 2.6 (1.0) 3.7 (1.0) 4.5 (0.9) 2.8 (1.1) 136.89 .283 abdef 78.35 .199 abdef .286 .254
OBE 4.2 (5.0) 7.9 (7.8) 12.6 (12.8) 0.6 (1.9) 155.54 .306 ALL 110.88 .262 ALL .294 .307
BDI 14.6 (9.1) 19.7 (10.0) 24.8 (10.3) 14.6 (9.5) 43.42 .121 abdef .148 .111

Note. Note: BED-ND = binge eating disorder – no distress; BED = binge eating disorder; BN = bulimia nervosa; NBPO = no-binge-eating/purging obese comparison group; BMI = body mass index; EDE-Q = eating disorder examination - questionnaire; OBE = objective bulimic episodes determined by EDE-Q; BDI = beck depression inventory.

All F-ratios significant at p<.001. df ranged from (3, 948) to (3,1070).

Posthoc tests (Scheffe for ANOVAs; Bonferroni for ANCOVAs) indicate significant group differences as follows: a: BED-ND vs. BED; b: BED- ND vs. BN; c: BED-ND vs. NBPO; d: BED vs. BN; e: BED vs. NBPO; f: BN vs. NBPO. ALL indicates that all groups significantly differed.