condition mean min max ZT0-3 0.0297235 0.0 0.059447 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.010004516666666666 0.0 0.020009033333333332 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0