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The parents were asked to report their annual household income (30 000 €, 30 001–60 000 €, and 60 001 €) and their highest completed or ongoing educational degrees (vocational school or less, polytechnic and university) in a questionnaire. We used the educational degree of the more educated parent in the analyses. The parents were also asked to report the medically diagnosed developmental disorders and attention-deficit hyperactivity disorder of their children.
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