condition mean min max ZT0-3 203.319196 203.319196 203.319196 ZT4-7 229.37356250000002 229.37356250000002 229.37356250000002 ZT8-11 264.4807225 264.4807225 264.4807225 ZT12-15 236.7231135 236.7231135 236.7231135 ZT16-19 238.615775 238.615775 238.615775 ZT20-23 330.0161375 330.0161375 330.0161375