condition mean min max ZT0-3 34.65 34.65 34.65 ZT4-7 54.2 54.2 54.2 ZT8-11 38.1 38.1 38.1 ZT12-15 52.6 52.6 52.6 ZT16-19 25.1 25.1 25.1 ZT20-23 36.1 36.1 36.1