condition mean min max ZT0-3 0.619777 0.48664399999999997 0.75291 ZT4-7 1.85531 1.85531 1.85531 ZT8-11 3.68567 3.68567 3.68567 ZT12-15 0 0 0 ZT16-19 1.26423 1.26423 1.26423 ZT20-23 0.5496495 0.5496495 0.5496495