condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0148933525 0.0 0.029786705 ZT16-19 0.009906198333333333 0.0 0.019812396666666666 ZT20-23 0.0 0.0 0.0