condition mean min max ZT0-3 103.447527 103.447527 103.447527 ZT4-7 88.6126485 88.6126485 88.6126485 ZT8-11 66.43226849999999 66.43226849999999 66.43226849999999 ZT12-15 65.422437 65.422437 65.422437 ZT16-19 42.25787 42.25787 42.25787 ZT20-23 42.8941935 42.8941935 42.8941935