condition mean min max ZT0-3 924.35 924.35 924.35 ZT4-7 851.0 851.0 851.0 ZT8-11 869.85 869.85 869.85 ZT12-15 1503.2 1503.2 1503.2 ZT16-19 1510.0 1510.0 1510.0 ZT20-23 1221.6999999999998 1221.6999999999998 1221.6999999999998