condition mean min max ZT0-3 1.2052718333333332 0.1981755 2.03298 ZT4-7 0.707923 0.707923 0.707923 ZT8-11 0.727448 0.727448 0.727448 ZT12-15 1.2196337499999998 1.0879155 1.3513519999999999 ZT16-19 2.5081249999999997 2.5081249999999997 2.5081249999999997 ZT20-23 0.7729299999999999 0.7729299999999999 0.7729299999999999