condition mean min max ZT0-3 2.6896361845 1.8020054209999998 3.577266948 ZT4-7 5.24911598375 4.472144304 6.0260876635 ZT8-11 19.53179717875 13.0340767525 26.029517605000002 ZT12-15 38.97887782 38.79227301 39.16548263 ZT16-19 32.612168025 30.326377115 34.897958935000005 ZT20-23 32.571802982499996 30.374963145 34.76864282