condition mean min max ZT0-3 8.8539 8.8539 8.8539 ZT4-7 7.55579 7.55579 7.55579 ZT8-11 8.03659 8.03659 8.03659 ZT12-15 8.1896 8.1896 8.1896 ZT16-19 10.24495 10.24495 10.24495 ZT20-23 8.61505 8.61505 8.61505