condition mean min max ZT0-3 48.75 48.75 48.75 ZT4-7 18.4 18.4 18.4 ZT8-11 42.7 42.7 42.7 ZT12-15 23.95 23.95 23.95 ZT16-19 37.8 37.8 37.8 ZT20-23 51.95 51.95 51.95