condition mean min max ZT0-3 26.519066666666667 19.3802 32.287400000000005 ZT4-7 20.3592 20.3592 20.3592 ZT8-11 34.5163 34.5163 34.5163 ZT12-15 45.999925000000005 42.5631 49.43675 ZT16-19 46.060599999999994 46.060599999999994 46.060599999999994 ZT20-23 42.1243 42.1243 42.1243