condition mean min max ZT0-3 18.56655 18.56655 18.56655 ZT4-7 12.99735 12.99735 12.99735 ZT8-11 9.658764999999999 9.658764999999999 9.658764999999999 ZT12-15 13.425605000000001 13.425605000000001 13.425605000000001 ZT16-19 22.50945 22.50945 22.50945 ZT20-23 15.59145 15.59145 15.59145