When they say given 'x number of prescriptions of gabapentin', what does a prescription actually mean dosage and length wise?

I would love more info on this because I have been taking gabapentin for years due to nerve damage from having Guilliane-Barre syndrome.

Edit: Re-reading the article, i see 'The researchers also acknowledge that their study was retrospective, and they weren't able to account for dose or length of gabapentin use.' - this seems like a pretty gaping hole in trying to draw an kind of conclusion from this