condition mean min max ZT0-3 5.223834999999999 5.223834999999999 5.223834999999999 ZT4-7 5.56414 5.56414 5.56414 ZT8-11 4.676275 4.676275 4.676275 ZT12-15 3.359175 3.359175 3.359175 ZT16-19 4.821249999999999 4.821249999999999 4.821249999999999 ZT20-23 4.4168 4.4168 4.4168