condition mean min max ZT0-3 18.9 18.9 18.9 ZT4-7 19.0 19.0 19.0 ZT8-11 45.3 45.3 45.3 ZT12-15 34.0 34.0 34.0 ZT16-19 36.3 36.3 36.3 ZT20-23 14.2 14.2 14.2