condition mean min max ZT0-3 0.431568 0.431568 0.431568 ZT4-7 0.314611 0.314611 0.314611 ZT8-11 0.397234 0.397234 0.397234 ZT12-15 0.2647915 0.2647915 0.2647915 ZT16-19 0.5623020000000001 0.5623020000000001 0.5623020000000001 ZT20-23 0.3605425 0.3605425 0.3605425