condition mean min max ZT0-3 3.04059113925 1.396290751 4.6848915275000005 ZT4-7 11.03253049425 9.6487567835 12.416304205 ZT8-11 12.07543055 11.107886345 13.042974755 ZT12-15 25.5738767175 23.095852745 28.051900689999997 ZT16-19 41.40096707 39.64454712 43.15738702 ZT20-23 52.3689323325 51.44993197 53.287932695