condition mean min max ZT0-3 52.328889 52.328889 52.328889 ZT4-7 43.549197 43.549197 43.549197 ZT8-11 42.920956000000004 42.920956000000004 42.920956000000004 ZT12-15 38.0139955 38.0139955 38.0139955 ZT16-19 40.780553999999995 40.780553999999995 40.780553999999995 ZT20-23 41.781399500000006 41.781399500000006 41.781399500000006