condition mean min max ZT0-3 24.2539 24.2539 24.2539 ZT4-7 19.7807 19.7807 19.7807 ZT8-11 16.63495 16.63495 16.63495 ZT12-15 23.483 23.483 23.483 ZT16-19 21.833599999999997 21.833599999999997 21.833599999999997 ZT20-23 23.2807 23.2807 23.2807