condition mean min max ZT0-3 8.041274999999999 8.041274999999999 8.041274999999999 ZT4-7 4.26459 4.26459 4.26459 ZT8-11 1.638126 1.638126 1.638126 ZT12-15 2.47153 2.47153 2.47153 ZT16-19 3.569355 3.569355 3.569355 ZT20-23 5.808435 5.808435 5.808435