condition mean min max ZT0-3 1.9817057830000002 1.916848266 2.0465633000000003 ZT4-7 2.5581708809999997 2.151126427 2.965215335 ZT8-11 17.1891705305 7.5971802885 26.781160772499998 ZT12-15 38.323917984999994 36.199874625 40.447961344999996 ZT16-19 25.954891959999998 22.24538016 29.66440376 ZT20-23 14.965614895 14.009237774999999 15.921992015