condition mean min max ZT0-3 11.11955 11.11955 11.11955 ZT4-7 9.727515 9.727515 9.727515 ZT8-11 5.27736 5.27736 5.27736 ZT12-15 7.974019999999999 7.974019999999999 7.974019999999999 ZT16-19 8.222 8.222 8.222 ZT20-23 11.1028 11.1028 11.1028