condition mean min max ZT0-3 9.246305 8.49607 9.99654 ZT4-7 4.451544999999999 4.451544999999999 4.451544999999999 ZT8-11 3.81054 3.81054 3.81054 ZT12-15 0 0 0 ZT16-19 5.534765 5.534765 5.534765 ZT20-23 6.589975 6.589975 6.589975