Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, Minneapolis, MN, United States of America.
Department of Educational Psychology, College of Human Development, University of Minnesota, Minneapolis, MN, United States of America.
PeerJ. 2022 Feb 15;10:e12717. doi: 10.7717/peerj.12717. eCollection 2022.
The Oral Impacts on Daily Performances (OIDP) index asks the respondents to indicate both, the frequency and severity of the impact. However, it is not clear if the two scaling methods are correlated, and if using one scale is sufficient. The purpose of the study was to investigate the correlation between frequency and severity rating scales of the OIDP instrument, and whether only one of the rating scales can be used instead of both.
A battery of patient-reported outcome questionnaires were administered to a consecutive sample of adult dental patients from HealthPartners dental clinics in Minnesota ( = 2,115). Only those who responded to any of the OIDP items were included in the analysis for this study ( = 873). We assessed correlations between the frequency and severity scales for all OIDP items, and for the summary scores of the two OIDP response scales. We additionally fit a categorical structural equation model (SEM) (or an item factor analysis model) and examined the correlation between two latent variables (Frequency and Severity).
The correlation estimates for all OIDP items were greater than 0.50, indicating large correlations between the frequency and severity scores for each OIDP item. The correlation estimate between the two summary scores was 0.85 (95% CI [0.82-0.86]). When we calculated the correlation coefficient using a latent variable model, the value increased to 0.96 (95% CI [0.93-1.00]).
Our study findings show that OIDP frequency and severity scores are highly correlated, which indicates the use of one scale only. Based on previous evidence, we recommend applying the frequency rating scale only in research and clinical settings.
OIDP 指数要求受访者同时指出影响的频率和严重程度。然而，目前尚不清楚这两种评分方法是否相关，以及是否只使用一种评分方法就足够了。本研究的目的是调查 OIDP 工具的频率和严重程度评分之间的相关性，以及是否可以只用一种评分代替两种。
一组患者报告的结果问卷被用于明尼苏达州 HealthPartners 牙科诊所的连续成年牙科患者样本（=2115）。只有那些对任何 OIDP 项目做出回应的患者才被纳入本研究的分析（=873）。我们评估了所有 OIDP 项目的频率和严重程度评分之间的相关性，以及两个 OIDP 反应评分的综合评分之间的相关性。我们还拟合了一个分类结构方程模型（SEM）（或项目因子分析模型），并检查了两个潜在变量（频率和严重程度）之间的相关性。
所有 OIDP 项目的相关系数都大于 0.50，表明每个 OIDP 项目的频率和严重程度评分之间存在较大的相关性。两个综合评分之间的相关系数为 0.85（95%置信区间[0.82-0.86]）。当我们使用潜在变量模型计算相关系数时，该值增加到 0.96（95%置信区间[0.93-1.00]）。
我们的研究结果表明，OIDP 频率和严重程度评分高度相关，这表明只使用一种评分即可。基于先前的证据，我们建议在研究和临床环境中仅使用频率评分。
