condition mean min max ZT0-3 39.956745 39.956745 39.956745 ZT4-7 49.6953545 49.6953545 49.6953545 ZT8-11 54.206973500000004 54.206973500000004 54.206973500000004 ZT12-15 71.374275 71.374275 71.374275 ZT16-19 107.377826 107.377826 107.377826 ZT20-23 111.835641 111.835641 111.835641