condition mean min max ZT0-3 17.013633333333335 16.56255 17.740099999999998 ZT4-7 14.55695 14.55695 14.55695 ZT8-11 14.178999999999998 14.178999999999998 14.178999999999998 ZT12-15 13.15495 13.1402 13.1697 ZT16-19 13.58605 13.58605 13.58605 ZT20-23 16.413800000000002 16.413800000000002 16.413800000000002