Subject: Altitude effects on body weight

I recently moved here (Puebla, Mexico) with my family and we all 
noticed that our scale reads our body weight lower than before we 
moved.  We moved from Cincinnati, Ohio and are now living at 7500 ft 
above sea level.  Did our scale get damaged in the move or does 
higher elevation have effect on measured body weight.  If so what is 
the mathematical correlation between weight at different altitudes?
Thank you,
Bill Ralph

Re: Altitude effects on body weight