condition mean min max ZT0-3 2.58747 2.58747 2.58747 ZT4-7 1.2976800000000002 1.2976800000000002 1.2976800000000002 ZT8-11 2.208015 2.208015 2.208015 ZT12-15 3.6226900000000004 3.6226900000000004 3.6226900000000004 ZT16-19 4.792985 4.792985 4.792985 ZT20-23 3.734495 3.734495 3.734495