condition mean min max ZT0-3 4.4066 4.4066 4.4066 ZT4-7 2.9280299999999997 2.9280299999999997 2.9280299999999997 ZT8-11 3.4413400000000003 3.4413400000000003 3.4413400000000003 ZT12-15 4.68644 4.68644 4.68644 ZT16-19 7.06391 7.06391 7.06391 ZT20-23 5.03529 5.03529 5.03529