condition mean min max ZT0-3 0.0758859 0.0753518 0.07642 ZT4-7 0.0 0.0 0.0 ZT8-11 0.4644755 0.4644755 0.4644755 ZT12-15 0 0 0 ZT16-19 0.2998303 0.2998303 0.2998303 ZT20-23 0.2257072 0.2257072 0.2257072