condition mean min max ZT0-3 7.027715000000001 7.027715000000001 7.027715000000001 ZT4-7 5.615645 5.615645 5.615645 ZT8-11 11.095849999999999 11.095849999999999 11.095849999999999 ZT12-15 10.97805 10.97805 10.97805 ZT16-19 9.837174999999998 9.837174999999998 9.837174999999998 ZT20-23 7.0865849999999995 7.0865849999999995 7.0865849999999995