condition mean min max ZT0-3 19.9365 19.9365 19.9365 ZT4-7 17.6292 17.6292 17.6292 ZT8-11 17.63175 17.63175 17.63175 ZT12-15 14.71075 14.71075 14.71075 ZT16-19 17.4913 17.4913 17.4913 ZT20-23 19.691000000000003 19.691000000000003 19.691000000000003