condition mean min max ZT0-3 17.3 17.3 17.3 ZT4-7 29.6 29.6 29.6 ZT8-11 23.0 23.0 23.0 ZT12-15 44.1 44.1 44.1 ZT16-19 28.85 28.85 28.85 ZT20-23 33.2 33.2 33.2