condition mean min max ZT0-3 11.52223325325 11.18470641 11.8597600965 ZT4-7 8.3067228235 8.0218710505 8.5915745965 ZT8-11 15.51969689875 11.482971987500001 19.55642181 ZT12-15 15.62198928 14.638034874999999 16.605943685 ZT16-19 12.866151542499999 12.762963769999999 12.969339315 ZT20-23 15.378973462500001 14.226380420000002 16.531566505