condition mean min max ZT0-3 1.07127575 0.43378649999999996 1.708765 ZT4-7 1.153441 1.153441 1.153441 ZT8-11 0.4286555 0.4286555 0.4286555 ZT12-15 0 0 0 ZT16-19 0.710894 0.710894 0.710894 ZT20-23 0.7147935 0.7147935 0.7147935