condition mean min max ZT0-3 7.3420000000000005 7.3420000000000005 7.3420000000000005 ZT4-7 8.779885 8.779885 8.779885 ZT8-11 5.37088 5.37088 5.37088 ZT12-15 4.744120000000001 4.744120000000001 4.744120000000001 ZT16-19 5.76393 5.76393 5.76393 ZT20-23 4.79618 4.79618 4.79618