condition mean min max ZT0-3 12.0353 7.64775 16.42285 ZT4-7 9.57941 9.57941 9.57941 ZT8-11 6.8495550000000005 6.8495550000000005 6.8495550000000005 ZT12-15 0 0 0 ZT16-19 13.29665 13.29665 13.29665 ZT20-23 19.05885 19.05885 19.05885