condition mean min max ZT0-3 1.1641533609999999 1.1079680779999999 1.220338644 ZT4-7 1.708331921 1.666072705 1.750591137 ZT8-11 4.1478830915 3.546504142 4.749262041 ZT12-15 5.0788699095 4.904743225333333 5.2529965936666665 ZT16-19 4.0281071048333335 3.477662468 4.578551741666667 ZT20-23 2.0892627900000003 2.016772448 2.161753132