condition mean min max ZT0-3 20.1 20.1 20.1 ZT4-7 2.7 2.7 2.7 ZT8-11 28.55 28.55 28.55 ZT12-15 13.2 13.2 13.2 ZT16-19 11.9 11.9 11.9 ZT20-23 27.65 27.65 27.65