condition mean min max ZT0-3 0.342187 0.342187 0.342187 ZT4-7 0.7728615 0.7728615 0.7728615 ZT8-11 0.4717805 0.4717805 0.4717805 ZT12-15 0.4459425 0.4459425 0.4459425 ZT16-19 0.22419450000000002 0.22419450000000002 0.22419450000000002 ZT20-23 0.306865 0.306865 0.306865