condition mean min max ZT0-3 10.328665 10.328665 10.328665 ZT4-7 11.529599999999999 11.529599999999999 11.529599999999999 ZT8-11 7.7672099999999995 7.7672099999999995 7.7672099999999995 ZT12-15 5.39702 5.39702 5.39702 ZT16-19 8.10427 8.10427 8.10427 ZT20-23 9.09715 9.09715 9.09715