condition mean min max ZT0-3 24.132911 24.132911 24.132911 ZT4-7 24.212598 24.212598 24.212598 ZT8-11 23.638675499999998 23.638675499999998 23.638675499999998 ZT12-15 24.6010655 24.6010655 24.6010655 ZT16-19 24.1700755 24.1700755 24.1700755 ZT20-23 22.1499415 22.1499415 22.1499415