condition mean min max ZT0-3 4.2804625000000005 3.328735 5.23219 ZT4-7 1.86285 1.86285 1.86285 ZT8-11 0.3461605 0.3461605 0.3461605 ZT12-15 0 0 0 ZT16-19 2.09929 2.09929 2.09929 ZT20-23 3.94517 3.94517 3.94517