condition mean min max ZT0-3 14.916450000000001 14.916450000000001 14.916450000000001 ZT4-7 12.088750000000001 12.088750000000001 12.088750000000001 ZT8-11 11.791599999999999 11.791599999999999 11.791599999999999 ZT12-15 11.01172 11.01172 11.01172 ZT16-19 13.67875 13.67875 13.67875 ZT20-23 10.9282 10.9282 10.9282