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 0.0 0.0 0.0 ZT16-19 0.08716800000000001 0.08716800000000001 0.08716800000000001 ZT20-23 0.3270516666666667 0.3270516666666667 0.3270516666666667