condition mean min max ZT0-3 167.001288 167.001288 167.001288 ZT4-7 154.7541875 154.7541875 154.7541875 ZT8-11 139.63591200000002 139.63591200000002 139.63591200000002 ZT12-15 137.495582 137.495582 137.495582 ZT16-19 186.11084549999998 186.11084549999998 186.11084549999998 ZT20-23 200.82559550000002 200.82559550000002 200.82559550000002