condition mean min max ZT0-3 49.75 49.75 49.75 ZT4-7 11.4 11.4 11.4 ZT8-11 30.25 30.25 30.25 ZT12-15 22.75 22.75 22.75 ZT16-19 98.0 98.0 98.0 ZT20-23 32.3 32.3 32.3