Chronotype is an individual's preferred timing of sleep and activity, and is often referred to as a later chronotype (or evening‐type) or an earlier chronotype (or morning‐type). Having an evening chronotype is associated with more severe depressive and anxiety symptoms. Based on these findings it is has been suggested that chronotype is a stable construct associated with vulnerability to develop depressive or anxiety disorders. To examine this, we test the stability of chronotype over 7 years, and its longitudinal association with the change in severity of depressive and anxiety symptoms.

中文翻译：

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在7年的随访期内，表型的稳定性及其与抑郁和焦虑症状的严重程度相关。

计时型是个人首选的睡眠和活动时间，通常被称为较晚的计时型（或晚上型）或较早的计时型（或早上型）。晚上的表型与更严重的抑郁和焦虑症状有关。基于这些发现，已经提出，表型是与发展为抑郁症或焦虑症的脆弱性相关的稳定结构。为了检验这一点，我们测试了7年以上的表型的稳定性，以及其与抑郁和焦虑症状严重程度的纵向相关性。