condition mean min max ZT0-3 0.3935025 0.0 0.787005 ZT4-7 3.25687 3.25687 3.25687 ZT8-11 0.820065 0.820065 0.820065 ZT12-15 0 0 0 ZT16-19 0.79434 0.79434 0.79434 ZT20-23 0.800115 0.800115 0.800115