condition mean min max ZT0-3 1.6795915 1.153793 2.20539 ZT4-7 0.9360565000000001 0.9360565000000001 0.9360565000000001 ZT8-11 0.320147 0.320147 0.320147 ZT12-15 0 0 0 ZT16-19 1.971435 1.971435 1.971435 ZT20-23 1.0271265 1.0271265 1.0271265