condition mean min max ZT0-3 7.922454999999999 7.922454999999999 7.922454999999999 ZT4-7 4.242355 4.242355 4.242355 ZT8-11 3.907125 3.907125 3.907125 ZT12-15 4.967935 4.967935 4.967935 ZT16-19 8.7309 8.7309 8.7309 ZT20-23 7.061145 7.061145 7.061145