condition mean min max ZT0-3 1.47996175 1.0238635 1.93606 ZT4-7 2.47149 2.47149 2.47149 ZT8-11 3.169715 3.169715 3.169715 ZT12-15 0 0 0 ZT16-19 3.355015 3.355015 3.355015 ZT20-23 2.27424 2.27424 2.27424