condition mean min max ZT0-3 19.570149999999998 19.570149999999998 19.570149999999998 ZT4-7 16.181849999999997 16.181849999999997 16.181849999999997 ZT8-11 13.35735 13.35735 13.35735 ZT12-15 24.984099999999998 24.984099999999998 24.984099999999998 ZT16-19 21.0184 21.0184 21.0184 ZT20-23 24.65155 24.65155 24.65155