Table 1. Descriptive Statistics (Study 1).

	Early Adolescence	Late Adolescence	Young Adulthood
Sample Size (n)	154	209	46
Age: Mean (SD)	11.44 (1.69)	17.23 (1.04)	21.22 (0.77)
2D:4D
Range	0.88-1.08	0.87-1.09	0.91-1.05
Mean (SD)	0.97 (0.03)	0.97 (0.04)	0.99 (0.03)
Minnesota Eating Behavior Survey (MEBS)
Total Score
Range (Max = 30)	0-18	0-21	0-24
Mean (SD)	4.57 (4.53)	5.02 (4.85)	7.17 (6.42)
% > clinical mean	4.54	4.83	13.0
Body Dissatisfaction
Range (Max = 6)	0-6	0-6	0-6
Mean (SD)	1.01 (1.47)	1.39 (1.82)	2.22 (2.19)
Bulimic Symptoms
Range (Max = 13)	0-8	0-8	0-8
Mean (SD)	0.91 (1.42)	1.13 (1.54)	1.42 (2.15)
Weight Preoccupation
Range (Max = 8)	0-8	0-8	0-8
Mean (SD)	1.93 (2.14)	2.02 (2.10)	2.87 (2.60)
Eating Disorder Examination Questionnaire (EDE-Q)
Global Score
Range (Max = 6)	0-3.6	0-4.4	0-4.5
Mean (SD)	0.57 (0.73)	0.86 (1.01)	1.26 (1.31)
% > clinical mean	0.65	2.40	8.70
Eating Disorder Examination Questionnaire (EDE-Q)
Dietary Restraint
Range (Max = 6)	0-4.6	0-4.8	0-5.4
Mean (SD)	0.43 (0.77)	0.55 (0.95)	0.95 (1.28)
Shape Concerns
Range (Max = 6)	0-5.5	0-5.8	0-5.8
Mean (SD)	0.69 (0.99)	1.23 (1.38)	1.64 (1.69)
Weight Concerns
Range (Max = 6)	0-5.2	0-5.6	0-4.40
Mean (SD)	0.71 (0.99)	1.02 (1.23)	1.39

Note. 2D:4D = index (2D)/ring (4D) finger; Participants were females from same-sex twin pairs (see Methods).