In the present study, we investigated the relationship between friendship quality (dimensions) and non-suicidal self-injury (NSSI) as well as the moderating role of gender and age in this relationship. The sample consisted of 463 children and adolescents (50.10% female, age range: 9-17 years). Friendship quality and NSSI were measured using the Friendship Qualities Scale (FQS; Bukowski, Hoza, & Boivin, 1994) and the Self Harm Inventory (SHI; Sansone, Wiederman, & Sansone, 1998), respectively. Overall, total friendship quality and NSSI were significantly and negatively related. Additionally, the relationship between total friendship quality and NSSI was moderated by gender and age. Specifically, girls with low friendship quality reported more NSSI; whereas for boys an opposite effect was found. As for age, friendship quality and NSSI were positively related in older participants. In younger participants, a relationship between friendship quality and NSSI seemed rather absent. This study highlights the important association between friendship quality and NSSI, as well as gender- and age-related differences in this association, which should be taken into account in the prevention and treatment of NSSI.

中文翻译：

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性别和年龄是否会调节社区儿童和青少年的友谊质量与非自杀性自伤之间的关系？

在本研究中，我们调查了友谊质量（维度）与非自杀性自伤 (NSSI) 之间的关系以及性别和年龄在这种关系中的调节作用。样本包括 463 名儿童和青少年（50.10% 为女性，年龄范围：9-17 岁）。友谊质量和 NSSI 分别使用友谊质量量表 (FQS; Bukowski, Hoza, & Boivin, 1994) 和自我伤害量表 (SHI; Sansone, Wiederman, & Sansone, 1998) 来衡量。总体而言，总友谊质量与 NSSI 呈显着负相关。此外，总友谊质量与 NSSI 之间的关系受性别和年龄的调节。具体来说，友谊质量低的女孩报告更多的 NSSI；而对于男孩，则发现了相反的效果。至于年龄，老年参与者的友谊质量和 NSSI 呈正相关。在年轻的参与者中，友谊质量和 NSSI 之间的关系似乎不存在。本研究强调了友谊质量与 NSSI 之间的重要关联，以及该关联中与性别和年龄相关的差异，在 NSSI 的预防和治疗中应予以考虑。