condition mean min max ZT0-3 21.198653 21.198653 21.198653 ZT4-7 26.6514375 26.6514375 26.6514375 ZT8-11 28.575967 28.575967 28.575967 ZT12-15 25.687592 25.687592 25.687592 ZT16-19 25.579864 25.579864 25.579864 ZT20-23 28.921971499999998 28.921971499999998 28.921971499999998