condition mean min max ZT0-3 69.84495 66.4437 73.24619999999999 ZT4-7 69.6696 69.6696 69.6696 ZT8-11 55.53005 55.53005 55.53005 ZT12-15 0 0 0 ZT16-19 42.745900000000006 42.745900000000006 42.745900000000006 ZT20-23 46.92125 46.92125 46.92125