Stewart W F, Lipton R B, Kolodner K, Liberman J, Sawyer J
Johns Hopkins School of Public Health, Baltimore, MD, USA.
Cephalalgia. 1999 Mar;19(2):107-14; discussion 74. doi: 10.1046/j.1468-2982.1999.019002107.x.
The Migraine Disability Assessment (MIDAS) score is used to quantify headache-related disability. In a previous study, we showed that the MIDAS score was highly reliable in population-based samples of migraine headache sufferers in two countries.
To examine the test-retest reliability and internal consistency of the five items comprising the MIDAS score and the overall MIDAS score in a population-based sample of both migraine and nonmigraine headache sufferers.
Using a clinically validated telephone interview, a population-based sample of migraine and nonmigraine headache sufferers was identified in Baltimore, Maryland, USA. A total of 97 migraine cases and 80 nonmigraine subjects completed the MIDAS questionnaire on two occasions an average of 3 weeks apart. The MIDAS score is derived from five questions about missed time from work (or school) and household work (one question each about missed days and days with at least 50% reduced productivity) and missed days of nonwork activities.
Among all headache sufferers the test-retest Spearman's correlations of individual MIDAS questions ranged from 0.67 to 0.73. The Spearman's correlation for the MIDAS score (i.e., sum of lost days and reduced effectiveness days in each domain) was 0.84. Cronbach's alpha, a measure of internal consistency, was 0.83. Mean and median item values and the overall MIDAS scores differed between migraine and nonmigraine cases. Even after adjusting for differences in headache frequency, the mean MIDAS scores differed substantially (i.e., 10.3 points) between migraine cases and nonmigraine cases.
The reliability and internal consistency of the MIDAS score are high, as tested in a population-based sample of headache sufferers. MIDAS scores are substantially higher in migraine cases than in non-migraine cases, supporting the validity of the measure.
偏头痛残疾评估（MIDAS）评分用于量化与头痛相关的残疾程度。在之前的一项研究中，我们表明MIDAS评分在两个国家基于人群的偏头痛患者样本中具有高度可靠性。
在基于人群的偏头痛和非偏头痛头痛患者样本中，检验构成MIDAS评分的五个项目以及总体MIDAS评分的重测信度和内部一致性。
通过临床验证的电话访谈，在美国马里兰州巴尔的摩市确定了一个基于人群的偏头痛和非偏头痛头痛患者样本。共有97例偏头痛患者和80例非偏头痛受试者分两次完成了MIDAS问卷，两次间隔平均为3周。MIDAS评分来自五个关于误工（或旷课）和家务劳动的问题（分别关于缺勤天数和生产力至少降低50%的天数各一个问题）以及非工作活动的缺勤天数。
在所有头痛患者中，MIDAS各单项问题的重测斯皮尔曼相关性在0.67至0.73之间。MIDAS评分（即每个领域的缺勤天数和效率降低天数之和）的斯皮尔曼相关性为0.84。作为内部一致性度量的克朗巴哈系数为0.83。偏头痛和非偏头痛病例的平均和中位数项目值以及总体MIDAS评分有所不同。即使在调整头痛频率差异后，偏头痛病例和非偏头痛病例的平均MIDAS评分仍有显著差异（即10.3分）。
在基于人群的头痛患者样本中进行测试时，MIDAS评分的可靠性和内部一致性很高。偏头痛病例的MIDAS评分显著高于非偏头痛病例，支持了该测量方法的有效性。
