condition mean min max ZT0-3 0.7382350777500001 0.333161467 1.1433086885000001 ZT4-7 5.423463752 3.9230294380000004 6.9238980660000005 ZT8-11 20.78714992775 13.1032983405 28.471001514999998 ZT12-15 29.887019759999998 25.88291536 33.89112416 ZT16-19 15.46977976425 13.3298854635 17.609674065 ZT20-23 8.809026209750002 8.495499551 9.122552868500001