condition mean min max ZT0-3 21.953850000000003 21.953850000000003 21.953850000000003 ZT4-7 18.66255 18.66255 18.66255 ZT8-11 14.47745 14.47745 14.47745 ZT12-15 15.818349999999999 15.818349999999999 15.818349999999999 ZT16-19 19.372349999999997 19.372349999999997 19.372349999999997 ZT20-23 21.372 21.372 21.372