I am assuming your diagnosis of osteoporosis is based on a T-score of -3.4 and not a Z-score of -3.4.
Ndicingela ukuba ukubonwa kwesifo sakho sobuthathaka nokuphela kwamathambo sisuselwe kwinqaku likaT eliku -3.4 hayi kwinqaku likaZ eliku -3.4.