condition mean min max ZT0-3 0.5976 0.5976 0.5976 ZT4-7 0.6474955 0.6474955 0.6474955 ZT8-11 0.6542355 0.6542355 0.6542355 ZT12-15 0.21412124999999999 0.21412124999999999 0.21412124999999999 ZT16-19 0.7019805 0.7019805 0.7019805 ZT20-23 0.505084 0.505084 0.505084