condition mean min max ZT0-3 0.01816945 0.0 0.0363389 ZT4-7 0.0733505 0.0733505 0.0733505 ZT8-11 0.03680175 0.03680175 0.03680175 ZT12-15 0 0 0 ZT16-19 0.0365332 0.0365332 0.0365332 ZT20-23 0.03663545 0.03663545 0.03663545