Schmier Jordana K, Halpern Michael T, Covert David
Exponent, Inc., Alexandria, VA 22314, USA.
Ophthalmic Epidemiol. 2006 Apr;13(2):137-43. doi: 10.1080/09286580600573049.
The Daily Living Tasks Dependent on Vision questionnaire (DLTV) has been used to assess functional impairment among patients with age-related macular degeneration (AMD). This study evaluated the psychometric properties of the DLTV using patient-reported rates of use of services and devices in an outpatient population.
The DLTV was included in a survey mailed to members of an AMD advocacy organization. Included in the survey were questions about demographic and clinical characteristics as well as questions about use of low vision aids and care-giving. Respondents provided informed consent. Data were analyzed in SAS.
Four respondents of 803 did not complete the DLTV; missing data were uncommon. Most (56%) respondents were male; the mean age was 73 years. Internal consistency reliability of the DLTV was 0.9699. Construct validity was demonstrated with moderate to high correlations between the DLTV and use of services and devices. The DLTV demonstrated discriminant validity and could distinguish between respondents with different levels of impairment, i.e., those who reported regular care-giving compared to those without regular care-giving.
In this outpatient population, the DLTV demonstrated reliability and validity. This analysis complements existing research and supports the use of the DLTV in AMD patients.
日常生活视力依赖任务问卷（DLTV）已被用于评估年龄相关性黄斑变性（AMD）患者的功能损害。本研究使用门诊患者报告的服务和设备使用率评估了DLTV的心理测量特性。
DLTV包含在邮寄给一个AMD倡导组织成员的调查问卷中。调查问卷包括有关人口统计学和临床特征的问题，以及有关低视力辅助器具使用和护理情况的问题。受访者提供了知情同意书。数据在SAS中进行分析。
803名受访者中有4人未完成DLTV；缺失数据并不常见。大多数（56%）受访者为男性；平均年龄为73岁。DLTV的内部一致性信度为0.9699。通过DLTV与服务和设备使用之间的中度到高度相关性证明了结构效度。DLTV显示出判别效度，能够区分不同损害程度的受访者，即报告有定期护理的受访者与没有定期护理的受访者。
在这个门诊患者群体中，DLTV显示出可靠性和有效性。本分析补充了现有研究，并支持在AMD患者中使用DLTV。
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