condition mean min max ZT0-3 478.922755 478.922755 478.922755 ZT4-7 357.3452305 357.3452305 357.3452305 ZT8-11 464.10295499999995 464.10295499999995 464.10295499999995 ZT12-15 556.7884985000001 556.7884985000001 556.7884985000001 ZT16-19 498.6836875 498.6836875 498.6836875 ZT20-23 576.49566 576.49566 576.49566