condition mean min max ZT0-3 21.20744291 13.45469637 28.96018945 ZT4-7 31.2171396825 28.387093380000003 34.047185985 ZT8-11 16.8146728225 14.50735568 19.121989964999997 ZT12-15 13.4968321525 13.208816395 13.78484791 ZT16-19 28.6330554575 24.734762605 32.53134831 ZT20-23 66.4463207075 45.505358715 87.3872827