condition mean min max ZT0-3 8.935874 8.935874 8.935874 ZT4-7 10.691791 10.691791 10.691791 ZT8-11 10.246412500000002 10.246412500000002 10.246412500000002 ZT12-15 11.394905 11.394905 11.394905 ZT16-19 11.0861755 11.0861755 11.0861755 ZT20-23 10.3216875 10.3216875 10.3216875