condition mean min max ZT0-3 23.55 23.55 23.55 ZT4-7 37.4 37.4 37.4 ZT8-11 20.9 20.9 20.9 ZT12-15 22.2 22.2 22.2 ZT16-19 27.599999999999998 27.599999999999998 27.599999999999998 ZT20-23 29.15 29.15 29.15