condition mean min max ZT0-3 16.9701788325 15.890126325 18.05023134 ZT4-7 21.448119972500002 20.59459334 22.301646605000002 ZT8-11 21.39965378 20.384051945 22.415255615 ZT12-15 15.17897941 14.418010095 15.939948725 ZT16-19 15.690165417500001 15.51087826 15.869452575 ZT20-23 18.4459251225 18.396149735 18.49570051