condition mean min max ZT0-3 5.39388083325 4.3000461119999995 6.4877155545 ZT4-7 5.7375928975 5.217395063 6.257790732 ZT8-11 6.2082230145 5.313884677499999 7.1025613514999995 ZT12-15 8.813306705999999 7.2876340294999995 10.3389793825 ZT16-19 9.03460557475 8.2876140825 9.781597067 ZT20-23 8.5575717465 8.12586074 8.989282753000001