condition mean min max ZT0-3 9.602864631 7.743753027 11.461976235 ZT4-7 9.386246479 8.144978743 10.627514215 ZT8-11 13.93041998 11.840089665 16.020750295 ZT12-15 13.4512649775 12.53020896 14.372320994999999 ZT16-19 12.009920795 11.39224728 12.62759431 ZT20-23 13.39366698 13.297764520000001 13.48956944