condition mean min max ZT0-3 6.533964082000001 5.519763387333334 7.548164776666667 ZT4-7 9.029406331 8.175307961000001 9.883504701 ZT8-11 10.457498590666667 10.031655542333334 10.883341639 ZT12-15 9.411038821666667 8.769812703 10.052264940333334 ZT16-19 9.0471016945 7.238594588 10.855608800999999 ZT20-23 7.532063843833333 5.068146970666667 9.995980717