condition mean min max ZT0-3 11.650859 11.650859 11.650859 ZT4-7 12.711724499999999 12.711724499999999 12.711724499999999 ZT8-11 11.476753500000001 11.476753500000001 11.476753500000001 ZT12-15 13.408389 13.408389 13.408389 ZT16-19 12.952673 12.952673 12.952673 ZT20-23 11.797073000000001 11.797073000000001 11.797073000000001