condition mean min max ZT0-3 23.2222852625 20.871497859999998 25.573072665 ZT4-7 24.103249585 19.16310098 29.04339819 ZT8-11 33.183606901666664 31.310080333333335 35.05713347 ZT12-15 12.554444568166666 8.168620341 16.94026879533333 ZT16-19 11.673974009666665 11.559013273333333 11.788934745999999 ZT20-23 9.017373393166668 8.436661617333334 9.598085169