condition mean min max ZT0-3 30.178600000000003 27.3746 32.982600000000005 ZT4-7 19.85125 19.85125 19.85125 ZT8-11 18.856099999999998 18.856099999999998 18.856099999999998 ZT12-15 0 0 0 ZT16-19 32.2155 32.2155 32.2155 ZT20-23 30.5143 30.5143 30.5143