Reliability of self-administered Work Ability Index questionnaire among Korean workers.
Although the Work Ability Index (WAI) has been used in many countries, its reliability is yet to be validated in Korea. In our study, test-retest results of WAI total score, WAI category and seven subscales were compared. The correlation coefficients of WAI total score and subscales 1 and 2 between test and retest were 0.70, 0.80 and 0.63, respectively. The κ values on WAI category, subscales 4, 5, 6 and 7 were 0.52, 0.32, 0.31, 0.48 and 0.85, respectively. The results of our reliability test show that WAI scores of female, younger and private company workers were found to be higher than those of male, older and public company workers, respectively. We conclude that overall test-retest reliability of WAI in Korea is acceptable. Another notable observation from our study is that work ability dimension (subscales 1, 2 and 7) had a higher reliability, whereas health dimension (subscales 3-6) had a lower reliability.
a Korea Safety Promotion Association , Seoul , Republic of Korea.
Dong-Joo
DJ
Yang
Dongmug
D
Kang
Young-Ki
YK
Kim
Yeun-Hee
YH
Kim
Yeong-Ae
YA
Yang
Su-Min
SM
Cha
Il Kyu
IK
Eom
Jong-Eun
JE
Kim
D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017149:Private Sector; D017150:Public Sector; D015203:Reproducibility of Results; D056910:Republic of Korea; D012737:Sex Factors; D011795:Surveys and Questionnaires; D014938:Work Capacity Evaluation; D055815:Young Adult