condition mean min max ZT0-3 1.3206250000000002 1.3206250000000002 1.3206250000000002 ZT4-7 1.8506999999999998 1.8506999999999998 1.8506999999999998 ZT8-11 2.361005 2.361005 2.361005 ZT12-15 3.281765 3.281765 3.281765 ZT16-19 1.59287 1.59287 1.59287 ZT20-23 1.88185 1.88185 1.88185