condition mean min max ZT0-3 14.775925 13.3185 16.23335 ZT4-7 20.377200000000002 20.377200000000002 20.377200000000002 ZT8-11 19.48545 19.48545 19.48545 ZT12-15 0 0 0 ZT16-19 21.539099999999998 21.539099999999998 21.539099999999998 ZT20-23 20.17865 20.17865 20.17865