Validity of the medical outcomes study sleep scale in patients with painful diabetic peripheral neuropathy in Korea.
OBJECTIVE
Sleep disturbances caused by painful diabetic neuropathy (PDN) might have substantial impacts on the multifaceted aspects of PDN, including quality of life. There are no convincing data on the validation or reliability of sleep problem measurements in patients with PDN in Korea. This large population-based cross-sectional study examined psychometric properties of the Medical Outcomes Study (MOS) Sleep Scale in patients with PDN in Korea.


METHODS
Measurements of patient-reported outcomes (Brief Pain Inventory-short form, MOS Sleep Scale and EuroQoL Health [EQ-5D]) were documented. PDN was diagnosed if the average daily pain intensity was ≥4 based on the visual analog scale or if patients were taking medication for their current pain.


RESULTS
There were 577 patients with PDN (41.6% with diabetic peripheral neuropathy). The internal consistency of reliability for the MOS Sleep Scale was 0.80 as measured by Cronbach's alpha. The extent to which multiple items in a dimension were intercorrelated and formed a dimension measuring the same underlying concept (Pearson's correlation coefficient) ranged from 0.24 to 0.71 (all P < 0.001). Each item of the MOS Sleep Scale was significantly correlated with the average pain score and the pain interference score (Pearson's correlation coefficients ranged from 0.20 to 0.28 and from 0.29 to 0.40, respectively; all P < 0.001). The correlations between the EQ-5D index and the MOS Sleep Scale ranged from -0.27 to -0.31 (all P < 0.001).


CONCLUSIONS
The MOS Sleep Scale showed good reliability in the evaluation of PDN in Korean type 2 diabetic patients.
Department of Internal Medicine Pusan National University Hospital Busan Korea.
Sang Soo
SS
Kim
Department of Internal Medicine Cardiovascular and Metabolic Disease Centre College of Medicine Inje University Korea.
Jong Chul
JC
Won
Department of Internal Medicine College of Medicine the Catholic University of Korea Seoul Korea.
Hyuk Sang
HS
Kwon
Department of Internal Medicine Sejong General Hospital Bucheon Korea.
Chong Hwa
CH
Kim
Department of Internal Medicine School of Medicine Catholic University of Daegu Daegu Korea.
Ji Hyun
JH
Lee
Department of Internal Medicine Chonbuk National University Medical School Jeonju Korea.
Tae Sun
TS
Park
Department of Internal Medicine Cardiovascular and Metabolic Disease Centre College of Medicine Inje University Korea.
Kyung Soo
KS
Ko
Department of Internal Medicine College of Medicine the Catholic University of Korea Seoul Korea.
Bong Yun
BY
Cha
Diabetic neuropathies; Pain; Sleep