condition mean min max ZT0-3 5.6859825 5.268405 6.10356 ZT4-7 7.431235 7.431235 7.431235 ZT8-11 5.8993199999999995 5.8993199999999995 5.8993199999999995 ZT12-15 0 0 0 ZT16-19 7.82991 7.82991 7.82991 ZT20-23 7.9916350000000005 7.9916350000000005 7.9916350000000005