condition mean min max ZT0-3 433.921664 433.921664 433.921664 ZT4-7 285.5746645 285.5746645 285.5746645 ZT8-11 352.577293 352.577293 352.577293 ZT12-15 450.7954465 450.7954465 450.7954465 ZT16-19 341.8821895 341.8821895 341.8821895 ZT20-23 203.9828715 203.9828715 203.9828715