Table 1 Sample characteristics regarding demographic characteristics, genotype and eating disorder psychopathology

N

130

97

–

Females/males (%)

85.4/14.6

74.2/25.8

X² (1, N = 227) = 4.426, p = 0.035

Age (yrs), M ± SD^a

41.0 ± 12.6

39.5 ± 13.6

T (1,217) =  − 0.81, p = 0.42

Age (yrs), range

19 – 67

19 − 73

–

BMI (kg/m²), M ± SD^b

38.7 ± 7.9

38.4 ± 6.5

T (1,222) =  − 0.29, p = 0.77

Genotype (%)^c

Homozygous A/A

13.1

8.3

X² (2, N = 227) = 2.17, p = 0.34

Heterozygous A/G

40.8

37.1

Homozygous G/G

46.2

54.6

EDE-Q^d

Restraint, M ± SD

1.7 ± 1.2

1.5 ± 1.5

T (1, 155) =  − 0.996, p = 0.321

Eating Concern, M ± SD

2.3 ± 1.3

1.6 ± 1.2

T (1,155) =  − 3.161, p = 0.002

Weight Concern, M ± SD

3.0 ± 1.4

1.8 ± 1.9

T (1,155) =  − 4.317, p < 0.001

Shape Concern, M ± SD

3.8 ± 1.2

3.0 ± 1.8

T (1,155) =  − 3.397, p = 0.001

Total Score, M ± SD

2.7 ± 0.9

2.0 ± 1.2

T (1,155) =  − 4.370, p < 0.001