condition mean min max ZT0-3 1.42922 1.2739449999999999 1.6582949999999999 ZT4-7 0.72698 0.72698 0.72698 ZT8-11 0.7683785 0.7683785 0.7683785 ZT12-15 0.88185925 0.831046 0.9326725 ZT16-19 0.9488540000000001 0.9488540000000001 0.9488540000000001 ZT20-23 1.4004750000000001 1.4004750000000001 1.4004750000000001