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 0.009973525 0.0 0.01994705 ZT16-19 0.020994166666666664 0.0 0.04198833333333333 ZT20-23 0 0 0