condition mean min max ZT0-3 0.066706 0.066706 0.066706 ZT4-7 0.00672865 0.00672865 0.00672865 ZT8-11 0.0093824 0.0093824 0.0093824 ZT12-15 0.0403263 0.0403263 0.0403263 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0