condition mean min max ZT0-3 73.676731 73.676731 73.676731 ZT4-7 279.7573125 279.7573125 279.7573125 ZT8-11 324.652918 324.652918 324.652918 ZT12-15 244.359204 244.359204 244.359204 ZT16-19 177.937422 177.937422 177.937422 ZT20-23 158.4300665 158.4300665 158.4300665