condition mean min max ZT0-3 42.75 42.75 42.75 ZT4-7 21.4 21.4 21.4 ZT8-11 49.95 49.95 49.95 ZT12-15 59.6 59.6 59.6 ZT16-19 20.5 20.5 20.5 ZT20-23 24.05 24.05 24.05