Beck Depression Inventory
This test was designed by Beck in 1961 (21). It was revised
in 1971 and published in 1978. Beck depression inventory
consisted of 21 items related to different symptoms. The
subject is asked to rate the symptoms in a 0 to 3 measurement
scale. The correlation of this inventory is 0.71 with
Hamilton depression rating scale and its test-retest reliability
after one week was calculated as 0.93. Its internal
consistency is also 0.91 (22). Bakhshani (23) reported its
α coefficient as 0.91, correlation coefficient as 0.89, and
test-retest coefficient as 0.94.