condition mean min max ZT0-3 2.8103975 2.5060700000000002 3.114725 ZT4-7 5.64607 5.64607 5.64607 ZT8-11 8.344674999999999 8.344674999999999 8.344674999999999 ZT12-15 0 0 0 ZT16-19 7.61448 7.61448 7.61448 ZT20-23 9.933465 9.933465 9.933465