condition mean min max ZT0-3 0.0091484 0.0 0.0182968 ZT4-7 0.03661735 0.03661735 0.03661735 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.01800865 0.01800865 0.01800865 ZT20-23 0.01813955 0.01813955 0.01813955