condition mean min max ZT0-3 15.508624999999999 14.7701 16.247149999999998 ZT4-7 10.72625 10.72625 10.72625 ZT8-11 9.952079999999999 9.952079999999999 9.952079999999999 ZT12-15 0 0 0 ZT16-19 13.757449999999999 13.757449999999999 13.757449999999999 ZT20-23 15.3682 15.3682 15.3682