condition mean min max ZT0-3 3.3579618333333334 1.5087855 4.92413 ZT4-7 2.77613 2.77613 2.77613 ZT8-11 1.227889 1.227889 1.227889 ZT12-15 1.27816675 1.155946 1.4003875 ZT16-19 3.51215 3.51215 3.51215 ZT20-23 2.1938899999999997 2.1938899999999997 2.1938899999999997