研究目的
本研究旨在探討青少年的社會網絡結構變化，以及其與憂鬱症狀、青春期的成熟時機的相關性。

研究方法
資料取自中央研究院的台灣青少年成長歷程研究，該研究是一個長期追蹤研究，從2000年開始在北台灣抽選40所學校的7年級生，進行問卷調查。問卷內容包含網絡結構、憂鬱症狀、青春期，並可以提名三個他最好的朋友。研究分析採用stochastic actor-oriented models。由於7到8年級與8到9年級的憂鬱變化程度並非線性，研究分析會被拆成兩個時期來檢驗環境壓力是否存在。

研究結果
在8到9年級時，青少年會傾向選擇與自己成熟程度相似以及憂鬱程度相似的人當朋友。在7到8年級時，青少年會傾向選早熟的人來當朋友。在控制住性別與青春期後，憂鬱的相似效果變得不顯著，青少年的憂鬱症狀不會影響他朋友的憂鬱症狀。

結論
研究結果顯示環境壓力會影響青少年的憂鬱症狀，以及憂鬱症狀跟友誼之間的關係。

Purpose: This study examined the change of network structure in relation to depressive symptoms and pubertal maturation in young adolescents over time.
Methods: Data were from the first three waves of the Taiwan Youth Project, a longitudinal study that started in 2000 and surveyed 7th graders from 40 junior high schools (Wave 1, age 13). Students were followed annually. Participants were asked to fill out a survey including social network assessment, depressive symptoms, pubertal maturation, and to name three best friends in school. The analysis was conducted using stochastic actor-oriented models. Because the increment of youth depression is more than the linear gradient of grade due to the high school entrance exam, the measures from 7th to 8th grade and 8th to 9th grade were separately treated as the indicators of environmental stressors in each state.
Results: Our findings indicate that adolescents selected friends based on the similarity in pubertal maturation from 8th to 9th grade and tended to nominate early-maturing adolescents as friends from 7th to 8th grade. Adolescents selected friends with a similar level of depressive symptoms only from 8th to 9th grade. After adjusting for gender and pubertal maturaion, the depression similarity effect was not significant, and adolescents’ depressive symptoms did not further influence their friends’ depressive symptoms.
Conclusions: Our study highlights the potentially magnifying effect of environmental stressors on adolescents’ depressive symptoms and how their depression affects the formation of friendship ties. More attention was needed to early-maturing adolescents on the association between friendship networks and depressive symptoms.

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