<prompt> The Hb level in healthy women has mean 13.5 gdl and standard detion 1.5 gdl, what is the Z score for a woman with Hb level 15.0 gdl:91021  <response>: The value 15gdl lies 1 SD 1.5gdl above the mean of 13.5gdl. Hence the Z score is 1. Ref : Parks Textbook of Preventive medicine 