condition mean min max ZT0-3 0.24259141666666667 0.14824075 0.325289 ZT4-7 0.4050125 0.4050125 0.4050125 ZT8-11 0.4211955 0.4211955 0.4211955 ZT12-15 0.37254875 0.304148 0.4409495 ZT16-19 0.30055149999999997 0.30055149999999997 0.30055149999999997 ZT20-23 0.25119165 0.25119165 0.25119165