condition mean min max ZT0-3 12.643494969999999 12.11765916 13.16933078 ZT4-7 9.85292093725 9.1486523545 10.55718952 ZT8-11 13.54547077 11.754413294999999 15.336528245 ZT12-15 8.4298812815 5.837835699499999 11.021926863500001 ZT16-19 5.718828811500001 5.408341716500001 6.029315906500001 ZT20-23 8.570686231500002 8.222399076 8.918973387000001