condition mean min max ZT0-3 24.401975 23.60755 25.196399999999997 ZT4-7 17.655450000000002 17.655450000000002 17.655450000000002 ZT8-11 16.84505 16.84505 16.84505 ZT12-15 0 0 0 ZT16-19 20.71835 20.71835 20.71835 ZT20-23 23.3438 23.3438 23.3438