condition mean min max ZT0-3 142.42002392499998 129.62747819999998 155.21256964999998 ZT4-7 88.39503807166666 80.83465432999999 95.95542181333333 ZT8-11 73.268366625 72.13871040666666 74.39802284333334 ZT12-15 78.63611216666666 76.18534878 81.08687555333333 ZT16-19 61.21398835 58.85934269333333 63.56863400666667 ZT20-23 69.34039655666666 65.75256020333333 72.92823290999999