condition mean min max ZT0-3 64.782905 64.782905 64.782905 ZT4-7 55.005807 55.005807 55.005807 ZT8-11 63.512491499999996 63.512491499999996 63.512491499999996 ZT12-15 69.1652695 69.1652695 69.1652695 ZT16-19 91.11417449999999 91.11417449999999 91.11417449999999 ZT20-23 92.497914 92.497914 92.497914