condition mean min max ZT0-3 9.3145725 8.071494999999999 10.55765 ZT4-7 30.365499999999997 30.365499999999997 30.365499999999997 ZT8-11 38.8913 38.8913 38.8913 ZT12-15 0 0 0 ZT16-19 19.996850000000002 19.996850000000002 19.996850000000002 ZT20-23 11.9702 11.9702 11.9702