condition mean min max ZT0-3 44.77575 44.77575 44.77575 ZT4-7 40.4051 40.4051 40.4051 ZT8-11 30.9861 30.9861 30.9861 ZT12-15 31.226100000000002 31.226100000000002 31.226100000000002 ZT16-19 34.975899999999996 34.975899999999996 34.975899999999996 ZT20-23 41.8939 41.8939 41.8939