condition mean min max ZT0-3 8.9729165 0.6526195 20.8232 ZT4-7 5.1905 5.1905 5.1905 ZT8-11 5.161825 5.161825 5.161825 ZT12-15 2.75937 2.18251 3.33623 ZT16-19 6.727355 6.727355 6.727355 ZT20-23 5.78632 5.78632 5.78632