condition mean min max ZT0-3 0.6731935 0.6731935 0.6731935 ZT4-7 0.308609 0.308609 0.308609 ZT8-11 0.393011 0.393011 0.393011 ZT12-15 0.8557275 0.8557275 0.8557275 ZT16-19 1.52324 1.52324 1.52324 ZT20-23 0.8185545000000001 0.8185545000000001 0.8185545000000001