In China, 80% of the grandparents are taking part in caring for grandchildren. However, it has been found by available studies that involvement in taking care of grandchildren may increase the risk of depression among grandparents, which would seriously harm their quality of life, and the risk of depression is associated with parent-grandparent coparenting conflict, grandparents' sense of valued elder and sense of mastery, but the underlying mechanism still requires further investigation.

To investigate the influence of parent-grandparent coparenting conflict on grandparents' depression, and to explore the mediating and moderating mechanisms that grandparents' sense of mastery and sense of valued elder may play in it.

This study used two surveys. Grandparents (totally 626 cases) who participated in caring for grandchildren were selected by snowball sampling to attend an online survey or by convenience sampling to attend an offline survey from August to November 2021 using four questionnaires, namely the Coparenting Relationship Scale (CRS), the Pearlin Mastery scale (PMS), Grandparent Meaning Scale (GMS), and the 9-item Chinese version of the Center for Epidemiological Studies Depression Scale (CES-D-C). Pearson correlation was used to analyze the relationship of mother-grandparent coparenting conflict score, father-grandparent coparenting conflict score, PMS score, score of the valued elder dimension of the GMS and CES-D-C. PROCESS was used to examine the mediating effect of grandparents' sense of mastery and the moderating effect of their sense of valued elder between parent-grandparent coparenting conflict and grandparents' depression, and to draw a simple slope diagram.

A total of 626 cases returned responsive questionnaires, with a response rate of 99.2%. The prevalence of depression tendency was 12.0% (75/626) in this study. The score of CES-D-C〔 (5.36±4.14) 〕 was found to be significantly positively correlated with mother-grandparent coparenting conflict score〔 (9.87±3.08), r=0.28, P<0.05〕, and father-grandparent coparenting conflict score〔 (7.34±3.25), r=0.35, P<0.05〕, but was negatively correlated with the PMS score 〔 (12.61±5.48), r=-0.25, P<0.05〕and the score of valued elder dimension〔 (84.13±8.58), r=-0.21, P<0.05〕. Grandparents' sense of mastery partially mediated the relationship of grandparents' depression with mother-grandparent coparenting conflict (with a size of indirect effect of 0.05, accounting for 17.2% of the total effects) and father-grandparent coparenting conflict (with a size of indirect effect of 0.04, accounting for 11.4% of the total effects). Grandparents' sense of valued elder moderated the relationship of grandparents' depression with mother-grandparent coparenting conflict (b=-0.06, P<0.05), and father-grandparent coparenting conflict (b=-0.07, P<0.05). The results of simple slope tests showed that among those with lower sense of valued elder, father-grandparent or mother-grandparent co-parenting conflict had a stronger influence on their depression than their counterparts with higher sense of valued elder.

Parent-grandparent (either mother-grandparent or father-grandparent) coparenting conflict is an important associated factor for grandparent's depression In this association, grandparent's sense of mastery plays a mediating role, while grandparent's sense of valued elder exerts a moderating effect. To reduce the risk of depression and promote the metal health among elders who take part in coparenting, efforts can be made to reduce coparenting conflicts and enhance the elders' sense of mastery and sense of valued elder.

我国参与照顾孙辈的祖辈占比已达80%，研究发现祖辈照顾孙辈可能增加祖辈抑郁风险，从而严重影响其生活质量。既往研究表明祖辈-父辈共同养育冲突、祖辈的长辈价值感和个人掌控感均是祖辈抑郁的影响因素，但其对祖辈抑郁的作用机制仍有待揭示。

剖析祖辈-父辈共同养育冲突对祖辈抑郁的影响，检验祖辈的个人掌控感在其中的中介作用及祖辈的长辈价值感在其中的调节效应。

本研究采用线上调查和线下调查相结合的方式。采用滚雪球抽样、方便抽样法，于2021年8—11月选取参与养育孙辈的631例（外）祖父母为研究对象，采用祖父母-父母共同养育问卷、个人掌控感问卷、祖父母意义问卷及流调中心抑郁量表（CES-D）中文简版对其进行调查。采用Pearson相关分析祖辈的祖辈-母亲共同养育冲突得分、祖辈-父亲共同养育冲突得分、个人掌控感问卷得分、祖父母意义问卷长辈价值感维度得分、CES-D中文简版得分间的相关性，采用PROCESS宏程序检验祖辈个人掌控感在祖辈-父辈共同养育冲突与祖辈抑郁关系中的中介作用，以及祖辈的长辈价值感在其中的调节效应，并绘制简单斜率图。

共回收有效问卷626份，问卷有效回收率为99.2%。626例（外）祖父母中，12.0%（75/626）存在抑郁倾向。祖辈的CES-D中文简版得分〔（5.36±4.14）分〕与其祖辈-母亲共同养育冲突得分〔（9.87±3.08）分〕、祖辈-父亲共同养育冲突得分〔（7.34±3.25）分〕呈正相关（r=0.28、0.35，P<0.05），与其个人掌控感问卷得分〔（12.61±5.48）分〕、祖父母意义问卷长辈价值感维度得分〔（84.13±8.58）分〕呈负相关（r=-0.25、-0.21，P<0.05）。祖辈个人掌控感在祖辈-母亲、祖辈-父亲共同养育冲突与祖辈抑郁的关系中起部分中介作用（间接效应值分别为0.05、0.04，分别占总效应值的17.2%、11.4%）；祖辈的长辈价值感对祖辈-母亲、祖辈-父亲共同养育冲突与祖辈抑郁的关系起调节效应（b=-0.06、-0.07，P<0.05）。简单斜率检验结果显示，对于长辈价值感水平较低的祖辈，祖辈-父亲、祖辈-母亲共同养育冲突对其抑郁的影响更大。

祖辈-父辈共同养育冲突，无论是发生在祖辈与孙辈母亲间还是祖辈与孙辈父亲间，都是影响祖辈抑郁的重要因素，祖辈个人掌控感在祖辈-父辈共同养育冲突与祖辈抑郁的关系中起中介作用，而祖辈的长辈价值感在其中存在调节效应。可通过减少祖辈-父辈共同养育冲突、增强祖辈的个人掌控感和长辈价值感，降低参与养育孙辈的祖辈的抑郁风险，提高其心理健康水平。