condition mean min max ZT0-3 0.021772025 0.0 0.04354405 ZT4-7 0.0873002 0.0873002 0.0873002 ZT8-11 0.08740534999999999 0.08740534999999999 0.08740534999999999 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.172265 0.172265 0.172265