condition mean min max ZT0-3 22.0679068 16.34898268 27.78683092 ZT4-7 60.779715589999995 47.4192779 74.14015327999999 ZT8-11 83.715022345 78.65157193499999 88.778472755 ZT12-15 90.1581205075 80.50658722 99.809653795 ZT16-19 59.0708955825 57.37322228 60.768568885 ZT20-23 64.71048909999999 62.44590719999999 66.975071