condition mean min max ZT0-3 0.39936575 0.2821795 0.516552 ZT4-7 0.1566665 0.1566665 0.1566665 ZT8-11 0.25516649999999996 0.25516649999999996 0.25516649999999996 ZT12-15 0 0 0 ZT16-19 0.875786 0.875786 0.875786 ZT20-23 0.25144999999999995 0.25144999999999995 0.25144999999999995