condition mean min max ZT0-3 18.678350000000002 18.678350000000002 18.678350000000002 ZT4-7 11.17081 11.17081 11.17081 ZT8-11 15.19865 15.19865 15.19865 ZT12-15 21.55225 21.55225 21.55225 ZT16-19 23.0015 23.0015 23.0015 ZT20-23 21.359650000000002 21.359650000000002 21.359650000000002