condition mean min max ZT0-3 1.018483 0.099088 1.9344649999999999 ZT4-7 0.615083 0.615083 0.615083 ZT8-11 1.001579 1.001579 1.001579 ZT12-15 0.6716605 0.4029815 0.9403395 ZT16-19 1.2884545 1.2884545 1.2884545 ZT20-23 0.482197 0.482197 0.482197