condition mean min max ZT0-3 9.89505 9.89505 9.89505 ZT4-7 11.5866695 11.5866695 11.5866695 ZT8-11 11.390201000000001 11.390201000000001 11.390201000000001 ZT12-15 10.570421499999998 10.570421499999998 10.570421499999998 ZT16-19 11.201732 11.201732 11.201732 ZT20-23 15.472514 15.472514 15.472514