condition mean min max ZT0-3 25.31355 25.31355 25.31355 ZT4-7 15.460899999999999 15.460899999999999 15.460899999999999 ZT8-11 19.4166 19.4166 19.4166 ZT12-15 25.894849999999998 25.894849999999998 25.894849999999998 ZT16-19 29.737949999999998 29.737949999999998 29.737949999999998 ZT20-23 32.85785 32.85785 32.85785