condition mean min max ZT0-3 9.447880000000001 9.447880000000001 9.447880000000001 ZT4-7 8.357745000000001 8.357745000000001 8.357745000000001 ZT8-11 8.857545 8.857545 8.857545 ZT12-15 10.3901 10.3901 10.3901 ZT16-19 11.051775 11.051775 11.051775 ZT20-23 10.4419 10.4419 10.4419