condition mean min max ZT0-3 22.649507 22.649507 22.649507 ZT4-7 24.052137000000002 24.052137000000002 24.052137000000002 ZT8-11 22.158287 22.158287 22.158287 ZT12-15 18.773032999999998 18.773032999999998 18.773032999999998 ZT16-19 22.0787885 22.0787885 22.0787885 ZT20-23 21.103108499999998 21.103108499999998 21.103108499999998