condition mean min max ZT0-3 831.194384 831.194384 831.194384 ZT4-7 717.377905 717.377905 717.377905 ZT8-11 647.2504839999999 647.2504839999999 647.2504839999999 ZT12-15 357.2464575 357.2464575 357.2464575 ZT16-19 984.8373735 984.8373735 984.8373735 ZT20-23 1015.0704025 1015.0704025 1015.0704025