condition mean min max ZT0-3 13.36905 11.6019 15.375150000000001 ZT4-7 9.805995 9.805995 9.805995 ZT8-11 11.376349999999999 11.376349999999999 11.376349999999999 ZT12-15 12.726374999999999 12.142949999999999 13.3098 ZT16-19 15.908 15.908 15.908 ZT20-23 16.3056 16.3056 16.3056