condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 3.406765 3.406765 3.406765 ZT12-15 4.5667925 3.706485 5.4271 ZT16-19 0.0 0.0 0.0 ZT20-23 3.59175 3.59175 3.59175