108 Chapter 4 was α = 0.68 for the total score, α = 0.87 for parental care, α = 0.66 for overprotection, and α = 0.78 for autonomy support. Edinburgh Handedness Inventory (EHI) Handedness was assessed by a modified 10-item version of the Edinburgh Handedness Inventory (EHI) developed by Oldfield (1971). The self-report questionnaire consists of ten questions about which hand is used during specific actions and answer categories were always left (−100), most times left (-50), both (0), most times right (50), and always right (100). Sum scores were calculated by the following formula for the laterality quotient (LQ): [R-L]/[R + L] × 100 and ranged from −100 (left-handedness in all tasks) to +100 (right-handedness in all tasks). To convert the continuous laterality quotient into a dichotomous variable of left- and right-handedness that was used to control for in analyses we used the cut-off score of zero with quotients > 0 indicating right-handedness and < 0 indicating left-handedness. In the current sample, 72 adolescents (n = 18 DEP, n = 54 HC) were right-handed (92.3%) and 6 adolescents (n = 1 DEP, n = 5 HC) were left handed (7.7%). Pubertal Development Scale (PDS) Pubertal status was assessed by the Pubertal Development Scale (PDS), prior to the first assessment day (Petersen et al., 1988). This self-report measure consists of five questions about secondary sexual characteristics, including growth spurt, body hair, changes in the skin, for boys a question about changes in voice and facial hair, and for girls a question about breast development and menarche. Answers were given on a four-point scale: (1) Had not yet started to develop, (2) was showing the first signs of development, (3) was showing clear development, or (4) had already finished developing. Scores were averaged to create a composite pubertal status score.
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