condition mean min max ZT0-3 2.81022232575 2.3925590695 3.227885582 ZT4-7 1.0853047774999998 1.0225201309999998 1.148089424 ZT8-11 1.60716325725 1.3090997325 1.9052267820000002 ZT12-15 1.8219924535 1.6216199944999998 2.0223649125 ZT16-19 0.7157815465 0.6067851625 0.8247779305 ZT20-23 1.3819213545 0.63691793 2.126924779