condition mean min max ZT0-3 29.132641 29.132641 29.132641 ZT4-7 27.392523 27.392523 27.392523 ZT8-11 44.949445 44.949445 44.949445 ZT12-15 37.3123065 37.3123065 37.3123065 ZT16-19 48.159896 48.159896 48.159896 ZT20-23 46.467818 46.467818 46.467818