condition mean min max ZT0-3 30.4112 30.4112 30.4112 ZT4-7 22.622999999999998 22.622999999999998 22.622999999999998 ZT8-11 20.773899999999998 20.773899999999998 20.773899999999998 ZT12-15 27.62325 27.62325 27.62325 ZT16-19 28.8741 28.8741 28.8741 ZT20-23 30.835 30.835 30.835