condition mean min max ZT0-3 3.30718038725 3.1081927830000002 3.5061679915 ZT4-7 4.92923769825 4.065661853 5.792813543499999 ZT8-11 7.6763764225 6.3724448185 8.9803080265 ZT12-15 8.762432644250001 8.712578651000001 8.8122866375 ZT16-19 6.997276889 5.8396782185000005 8.1548755595 ZT20-23 10.25901309 9.86692485 10.65110133