condition mean min max ZT0-3 37.65 37.65 37.65 ZT4-7 50.8 50.8 50.8 ZT8-11 32.7 32.7 32.7 ZT12-15 74.0 74.0 74.0 ZT16-19 52.5 52.5 52.5 ZT20-23 60.4 60.4 60.4