condition mean min max ZT0-3 4.962855 4.962855 4.962855 ZT4-7 5.017015000000001 5.017015000000001 5.017015000000001 ZT8-11 5.284834999999999 5.284834999999999 5.284834999999999 ZT12-15 4.31501 4.31501 4.31501 ZT16-19 4.25589 4.25589 4.25589 ZT20-23 4.5413 4.5413 4.5413