condition mean min max ZT0-3 4.7499199999999995 4.7499199999999995 4.7499199999999995 ZT4-7 3.51053 3.51053 3.51053 ZT8-11 2.822985 2.822985 2.822985 ZT12-15 4.47098 4.47098 4.47098 ZT16-19 5.237215 5.237215 5.237215 ZT20-23 4.63023 4.63023 4.63023