condition mean min max ZT0-3 0.573209586 0.198420265 0.947998907 ZT4-7 2.2224369597500004 2.083036427 2.3618374925000003 ZT8-11 1.811743085 1.7771373475 1.8463488225 ZT12-15 2.9058880185 2.4853708704999997 3.3264051665 ZT16-19 4.783256119500001 3.8915568460000003 5.674955393 ZT20-23 6.0587669344999995 5.1836314465 6.933902422499999