condition mean min max ZT0-3 64.3665 64.3665 64.3665 ZT4-7 56.746900000000004 56.746900000000004 56.746900000000004 ZT8-11 49.73745 49.73745 49.73745 ZT12-15 40.429199999999994 40.429199999999994 40.429199999999994 ZT16-19 69.5348 69.5348 69.5348 ZT20-23 60.768 60.768 60.768