condition mean min max ZT0-3 0.887493 0.887493 0.887493 ZT4-7 0.6907175 0.6907175 0.6907175 ZT8-11 0.542288 0.542288 0.542288 ZT12-15 0.4873075 0.4873075 0.4873075 ZT16-19 0.4462085 0.4462085 0.4462085 ZT20-23 0.709353 0.709353 0.709353