condition mean min max ZT0-3 0.528464 0.528464 0.528464 ZT4-7 0.3735905 0.3735905 0.3735905 ZT8-11 0.36834900000000004 0.36834900000000004 0.36834900000000004 ZT12-15 0.500134 0.500134 0.500134 ZT16-19 0.4059195 0.4059195 0.4059195 ZT20-23 0.7785679999999999 0.7785679999999999 0.7785679999999999