condition mean min max ZT0-3 15.471350000000001 12.94665 17.99605 ZT4-7 11.607399999999998 11.607399999999998 11.607399999999998 ZT8-11 10.074895 10.074895 10.074895 ZT12-15 0 0 0 ZT16-19 9.451435 9.451435 9.451435 ZT20-23 13.267199999999999 13.267199999999999 13.267199999999999