condition mean min max ZT0-3 12.128866666666665 11.808399999999999 12.74025 ZT4-7 11.571100000000001 11.571100000000001 11.571100000000001 ZT8-11 11.011700000000001 11.011700000000001 11.011700000000001 ZT12-15 11.523475000000001 11.0541 11.99285 ZT16-19 10.4829 10.4829 10.4829 ZT20-23 14.0637 14.0637 14.0637