condition mean min max ZT0-3 134.017134 134.017134 134.017134 ZT4-7 140.409206 140.409206 140.409206 ZT8-11 216.966084 216.966084 216.966084 ZT12-15 168.5885375 168.5885375 168.5885375 ZT16-19 214.32918800000002 214.32918800000002 214.32918800000002 ZT20-23 194.11685749999998 194.11685749999998 194.11685749999998