Table 1

Descriptive statistics between groups for gender, age, body weight and educational attainment

 N 1. Non-binge eating (n=2578) 2. OBE (n=353) 3. SBE (n=20) 4. OSBE (n=77) Statistic P value Posthoc Effect size Age, M (SD) 3026 47.1 (18.8) 40.0 (15.6) 46.4 (15.9) 37.4 (15.8) F=27.11, df=3, 3023 <0.001 1>2 d=0.44 95% CI 0.33 to 0.55 1>4 d=0.57 95% CI 0.34 to 0.79 BMI kg/m2,* M (SD) 2749 26.7 (5.2) 28.0 (5.6) 26.0 (4.9) 30.5 (6.7) F=16.01, df=3, 2746 <0.001 1<2 d=−0.26 95% CI −0.38 to −0.14 1<4 d =−0.71 95% CI −0.95 to 0.46 2<4 d =−0.41 95% CI −0.67 to −0.14 3<4 d =−0.60 95% CI −1.11 to −0.58 Gender, n (%) 3047 χ2=4.17, df=3 0.244 n.a. n.a. Male 1260 (48.9) 187 (53.0) 7 (35.0) 35 (45.5) Female 1318 (51.1) 166 (47.0) 13 (65.0) 42 (54.5) Education, n (%) 3045 χ2=12.119, df=6 0.059 n.a. n.a. No tertiary qualification 1014 (39.4) 130 (36.8) 5 (25.0) 33 (42.9) Trade or certificate 954 (37.0) 115 (32.6) 7 (35.0) 28 (36.4) n.a. Bachelor or higher 608 (23.6) 108 (30.6) 8 (40.0) 16 (20.8) Distress related to binge eating, n (%) 353 108 (30.6) 7 (35) χ2=0.172, df=1 0.804* n.a. n.a. Overvaluation, median (IQR) 2993 3.0 (1.0, 3.0, 4.0) 4.0 (2.0, 4.0, 5.0) 2.9 (1.0, 2.9, 4.6) 4.0 (3.0, 4.0, 5.0) Kruskal-Wallis H=49.537, df=3 <0.001 1<2 r=0.11 1<4 r=0.07 3<4 r=0.22
• *Distress was only compared between OBE only (353) and SBE only (20) groups, Fisher exact test used.

• BMI, body mass index; d, Cohen ’s d; OBE, recurrent objective binge eating alone; n.a., not applicable; OSBE, mixed objective and subjective recurrent binge eating episodes; ; SBE, recurrent subjective binge eating alone.