The award was given to the best play, musical or non-musical, which had already appeared on Broadway in a previous production.
No award was presented in 1979.
... spread out with 27.6% under the age of 18, 6.2% from 18 to 24, 17.7% from 25 to 44, 36.0% from 45 to 64, and 12.5% who are 65 years of age or older. The median age is 44 ...