condition mean min max ZT0-3 0.039372 0.0 0.078744 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.033209666666666665 0.0 0.06641933333333333 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0