Mapi Values, Bollington, UK.
Value Health. 2009 Jul-Aug;12(5):828-37. doi: 10.1111/j.1524-4733.2009.00504.x.
Developed using focus groups, the Oily Skin Self Assessment Scale (OSSAS) and Oily Skin Impact Scale (OSIS) are patient-reported outcome measures of oily facial skin.
The aim of this study was to finalize the item-scale structure of the instruments and perform psychometric validation in adults with self-reported oily facial skin.
The OSSAS and OSIS were administered to 202 adult subjects with oily facial skin in the United States. A subgroup of 152 subjects returned, 4 to 10 days later, for test–retest reliability evaluation.
Of the 202 participants, 72.8% were female; 64.4% had self-reported nonsevere acne. Item reduction resulted in a 14-item OSSAS with Sensation (five items), Tactile (four items) and Visual (four items) domains, a single blotting item, and an overall oiliness item. The OSIS was reduced to two three-item domains assessing Annoyance and Self-Image. Confirmatory factor analysis supported the construct validity of the final item-scale structures. The OSSAS and OSIS scales had acceptable item convergent validity (item-scale correlations >0.40) and floor and ceiling effects (<20%). Cronbach's alpha coefficients ranged from 0.83 to 0.89 for the OSSAS and 0.82 to 0.87 for the OSIS, demonstrating excellent internal consistency. The a priori test–retest reliability criterion (intraclass correlation [ICC] ≥0.7) was met for one of the three OSSAS domains and one of the two OSIS domains. OSSAS and OSIS domains distinguished among groups that differed in patient-reported facial oily skin severity (P < 0.0001), and bother associated with oily skin (P < 0.0001).
The OSSAS and OSIS versions tested in this study have been found to have strong psychometric properties in this patient sample (adults with self-reported oily facial skin), as assessments of self-reported oily facial skin severity and its emotional impact, respectively.
油性皮肤自我评估量表（OSSAS）和油性皮肤影响量表（OSIS）是使用焦点小组开发的，用于评估面部油性皮肤的患者报告结局测量工具。
本研究旨在确定这些工具的项目-量表结构，并在自我报告面部油性皮肤的成年人中进行心理测量验证。
在美国，202 名有面部油性皮肤的成年人接受了 OSSAS 和 OSIS 评估。其中 152 名参与者在 4 至 10 天后返回，进行测试-重测信度评估。
202 名参与者中，72.8%为女性；64.4%有自我报告的非严重痤疮。通过项目删减，得到一个 14 项的 OSSAS，包括感觉（五项）、触觉（四项）和视觉（四项）领域、一项单独的吸油面纸项目和一项整体油腻感项目。OSIS 被简化为两个评估烦恼和自我形象的三个项目领域。验证性因子分析支持最终项目-量表结构的构念效度。OSSAS 和 OSIS 量表具有可接受的项目收敛效度（项目-量表相关性>0.40）和地板和天花板效应（<20%）。OSSAS 的克朗巴赫 α 系数范围为 0.83 至 0.89，OSIS 的系数范围为 0.82 至 0.87，表明具有极好的内部一致性。OSSAS 的三个领域和 OSIS 的两个领域中，有一个领域满足了预先测试-重测可靠性标准（组内相关系数[ICC]≥0.7）。OSSAS 和 OSIS 领域可以区分患者报告的面部油性皮肤严重程度不同的人群（P<0.0001），以及与油性皮肤相关的烦恼程度（P<0.0001）。
在本研究中测试的 OSSAS 和 OSIS 版本在患者样本（自我报告面部油性皮肤的成年人）中具有较强的心理测量特性，分别作为自我报告面部油性皮肤严重程度和其情绪影响的评估工具。
