condition mean min max ZT0-3 5.830778333333334 3.867495 6.9302150000000005 ZT4-7 2.133415 2.133415 2.133415 ZT8-11 2.73359 2.73359 2.73359 ZT12-15 4.8556875 4.078575 5.6328 ZT16-19 5.07683 5.07683 5.07683 ZT20-23 7.1948799999999995 7.1948799999999995 7.1948799999999995