condition mean min max ZT0-3 20.68815 20.68815 20.68815 ZT4-7 33.272 33.272 33.272 ZT8-11 23.60955 23.60955 23.60955 ZT12-15 14.6067 14.6067 14.6067 ZT16-19 15.2617 15.2617 15.2617 ZT20-23 15.1509 15.1509 15.1509