NDRT for Adults?

Good morning.

I am looking for some information on the Nelson Denny Reading Test as an assessment tool for adults. I am a former K-12 educator, and am aware of its uses and norms at that age level, but am unaware of how valid it is considered for non-ELL adults. Any research or personal insight anyone could give would be very appreciated.  Thanks!

Sincerely,

Megan Casey