condition mean min max ZT0-3 1.3846721666666668 1.0172415000000001 1.7881550000000002 ZT4-7 1.717745 1.717745 1.717745 ZT8-11 1.171188 1.171188 1.171188 ZT12-15 1.90296825 1.6752965 2.13064 ZT16-19 1.55158 1.55158 1.55158 ZT20-23 0.979233 0.979233 0.979233