condition mean min max ZT0-3 0.0272735 0.0 0.054547 ZT4-7 0.219014 0.219014 0.219014 ZT8-11 0.3257935 0.3257935 0.3257935 ZT12-15 0 0 0 ZT16-19 0.160933 0.160933 0.160933 ZT20-23 0.3236735 0.3236735 0.3236735