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 0.0 0.0 0.0 ZT16-19 0.3022413615 0.0 0.604482723 ZT20-23 0.15121348583333333 0.0 0.30242697166666666