condition mean min max ZT0-3 19.21895 19.21895 19.21895 ZT4-7 23.530250000000002 23.530250000000002 23.530250000000002 ZT8-11 14.13635 14.13635 14.13635 ZT12-15 13.36335 13.36335 13.36335 ZT16-19 17.3421 17.3421 17.3421 ZT20-23 15.222000000000001 15.222000000000001 15.222000000000001