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 0.037900166666666665 0.0 0.07580033333333333 ZT16-19 0.026988300000000003 0.026988300000000003 0.026988300000000003 ZT20-23 0.058092 0.058092 0.058092