condition mean min max ZT0-3 0.012968529666666666 0.0 0.02593705933333333 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 0.020175189000000003 0.020149424000000003 0.020200954 ZT20-23 0.0316189405 0.021296145 0.041941736