condition mean min max ZT0-3 621.424364 621.424364 621.424364 ZT4-7 359.87975 359.87975 359.87975 ZT8-11 386.9422155 386.9422155 386.9422155 ZT12-15 427.410396 427.410396 427.410396 ZT16-19 683.006306 683.006306 683.006306 ZT20-23 627.5903225 627.5903225 627.5903225