condition mean min max ZT0-3 12.95978122925 11.0572849985 14.86227746 ZT4-7 3.81560391125 3.072652971 4.5585548515 ZT8-11 2.6783515995 2.5240547165000002 2.8326484825 ZT12-15 4.94077066 3.9858630570000004 5.895678263000001 ZT16-19 6.39956216625 5.654984061 7.1441402714999995 ZT20-23 9.465181186 9.1632298725 9.7671324995