Division of General Internal Medicine, Massachusetts General Hospital, 100 Cambridge St, 16th Floor, Boston, MA, 02114, USA.
Harvard Medical School, Boston, MA, USA.
Qual Life Res. 2021 Apr;30(4):1191-1198. doi: 10.1007/s11136-020-02728-7. Epub 2021 Jan 2.
To validate the Impact Index, a short, publicly available scale that measures the extent to which a respondent's health problem adversely impacts their quality of life.
Secondary analysis of patients with hip or knee osteoarthritis surveyed after visiting a surgeon at baseline (N = 322) and about 6 months after the visit (N = 283). Patients responded to the Impact Index and previously validated questionnaires about overall health, pain, and function. The Impact Index includes four questions that ask how much the respondent is bothered, worried, limited, or in pain due to their health condition over the past 30 days. Total scores range from 0 to 12; higher scores indicate more deleterious impact.
Patients were mostly female (55%), majority white (95%), had an average age of 65 (SD = 9), and most had surgery (64%). The baseline Impact Index score was 9.48 (SD = 2.63); at follow up 4.75 (SD = 3.54). Impact Index was related to overall health at baseline (r = - 0.49). For knee patients at baseline, Impact Index was negatively related to their knee symptoms (r = - 0.49) and knee pain (r = - 0.67). For hip patients at baseline, Impact Index was negatively related to the Harris Hip score (r = - 0.62). Scale directions varied; however, the signs of all correlations were as hypothesized. The Impact Index was predictive of surgical choice (p < .001, OR = 1.45), however, overall health (p = .88) and comorbidity (p = .24) measures were not. Reliability was acceptable (α = 0.85). Responsiveness statistics suggested overall health, pain, function, and Impact Index measures reflected improvement patients experienced from surgery. The Impact Index had the largest effect sizes (> - 3.4) and Guyatt Responsiveness Statistics (> - 2.3).
The Impact Index demonstrated strong evidence of validity, reliability, and responsiveness in hip or knee osteoarthritis patients.
验证 Impact Index，这是一种简短的、公开可用的量表，用于衡量受访者的健康问题对其生活质量的不利影响程度。
对基线时（N=322）和就诊后约 6 个月（N=283）接受髋关节或膝关节骨关节炎手术的患者进行二次分析。患者对 Impact Index 和先前验证过的关于整体健康、疼痛和功能的问卷进行了回答。Impact Index 包含四个问题，询问受访者在过去 30 天内，由于健康状况而感到困扰、担忧、受限或疼痛的程度。总分为 0 到 12 分；得分越高表示影响越严重。
患者大多为女性（55%），多数为白人（95%），平均年龄为 65（SD=9），大多数接受了手术（64%）。基线 Impact Index 评分为 9.48（SD=2.63）；随访时为 4.75（SD=3.54）。Impact Index 与基线时的整体健康状况相关（r=-0.49）。对于基线时的膝关节患者，Impact Index 与膝关节症状（r=-0.49）和膝关节疼痛（r=-0.67）呈负相关。对于基线时的髋关节患者，Impact Index 与 Harris Hip 评分呈负相关（r=-0.62）。虽然量表的方向有所不同，但所有相关性的符号均符合假设。Impact Index 可预测手术选择（p<0.001，OR=1.45），而整体健康状况（p=0.88）和合并症（p=0.24）指标则不能。可靠性可接受（α=0.85）。反应性统计数据表明，整体健康状况、疼痛、功能和 Impact Index 指标反映了患者从手术中获得的改善。Impact Index 的效应量最大（>-3.4），Guyatt 反应性统计量最大（>-2.3）。
在髋关节或膝关节骨关节炎患者中，Impact Index 具有较强的有效性、可靠性和反应性证据。
