An investigator evaluated 100 patients suffering from major depression as confirmed by the attending psychiatrist. The results were as follows:

An investigator evaluated 100 patients suffering from major depression as confirmed by the attending psychiatrist. The results were as follows:

Clinical Depression

Present Absent

+ 12 18 (12+18)

Test

- 28 42 (28+42)

(12+28) (18+42) N = 100

What will be the Negative predictive value?