Most people will experience bereavement grief, but some suffer from persistent or prolonged (PoP) grief, grief that used to be identified as “complicated” before recent DSM-5 and ICD-11 definitional developments. In 2020, a scoping literature review was undertaken to identify and consolidate contemporary evidence from research articles published in 2018 or 2019 in paper-based and open access peer-review journals on: (a) the incidence or prevalence of PoP grief, and (b) who develops it or is diagnosed as suffering from it, and correspondingly what causative factors or predictors are associated with PoP grief. All of the 11 identified research articles reported an incidence or prevalence rate, with these varying greatly, but with a much higher rate now that a 6-month post-death measurement timeframe is used. The predictors or factors among people who were identified as having PoP grief also varied considerably, although sudden and unexpected deaths were often implicated.

大多数人会经历丧亲之痛，但有些人会遭受持续或长期（PoP）的悲痛，这种悲痛在最近的 DSM-5 和 ICD-11 定义发展之前被认为是“复杂的”。2020 年，进行了范围界定文献审查，以从 2018 年或 2019 年发表在纸质和开放获取同行评审期刊上的研究文章中识别和整合当代证据，涉及：(a) PoP 悲伤的发生率或流行率，以及 (b ）谁发展或被诊断为患有它，以及相应的致病因素或预测因素与 PoP 悲伤有关。所有 11 篇确定的研究文章都报告了发病率或患病率，这些变化很大，但现在使用 6 个月的死后测量时间框架，发病率或患病率要高得多。