condition mean min max ZT0-3 42.73659 42.73659 42.73659 ZT4-7 15.934507 15.934507 15.934507 ZT8-11 15.674035 15.674035 15.674035 ZT12-15 14.889199999999999 14.889199999999999 14.889199999999999 ZT16-19 15.154623 15.154623 15.154623 ZT20-23 15.473028 15.473028 15.473028