condition mean min max ZT0-3 9.07968 9.07968 9.07968 ZT4-7 5.83351 5.83351 5.83351 ZT8-11 8.81005 8.81005 8.81005 ZT12-15 8.01078 8.01078 8.01078 ZT16-19 10.033945 10.033945 10.033945 ZT20-23 9.83715 9.83715 9.83715