condition mean min max ZT0-3 21.72876 21.72876 21.72876 ZT4-7 20.78549 20.78549 20.78549 ZT8-11 23.716157000000003 23.716157000000003 23.716157000000003 ZT12-15 36.8310465 36.8310465 36.8310465 ZT16-19 21.0322815 21.0322815 21.0322815 ZT20-23 22.809572 22.809572 22.809572