condition mean min max ZT0-3 3.80093 2.774155 5.490460000000001 ZT4-7 11.28316 11.28316 11.28316 ZT8-11 9.513865 9.513865 9.513865 ZT12-15 14.47005 13.044 15.8961 ZT16-19 7.63576 7.63576 7.63576 ZT20-23 5.005675 5.005675 5.005675