condition mean min max ZT0-3 2.206735 2.206735 2.206735 ZT4-7 0.7575675 0.7575675 0.7575675 ZT8-11 2.51626 2.51626 2.51626 ZT12-15 2.37879 2.37879 2.37879 ZT16-19 3.1761049999999997 3.1761049999999997 3.1761049999999997 ZT20-23 1.6507800000000001 1.6507800000000001 1.6507800000000001