condition mean min max ZT0-3 2123.248687 2123.248687 2123.248687 ZT4-7 1519.887269 1519.887269 1519.887269 ZT8-11 988.213671 988.213671 988.213671 ZT12-15 923.9965355 923.9965355 923.9965355 ZT16-19 1341.014435 1341.014435 1341.014435 ZT20-23 2016.068483 2016.068483 2016.068483