condition mean min max ZT0-3 0.4191586666666667 0.3001385 0.5341055 ZT4-7 0.14829975 0.14829975 0.14829975 ZT8-11 0.4174775 0.4174775 0.4174775 ZT12-15 0.6323460000000001 0.5537385 0.7109535 ZT16-19 0.5754815 0.5754815 0.5754815 ZT20-23 0.5693555 0.5693555 0.5693555