condition mean min max ZT0-3 0.23218025 0.146349 0.3180115 ZT4-7 0.3488235 0.3488235 0.3488235 ZT8-11 0.380231 0.380231 0.380231 ZT12-15 0 0 0 ZT16-19 0.4365075 0.4365075 0.4365075 ZT20-23 0.4626825 0.4626825 0.4626825