condition mean min max ZT0-3 24.0 24.0 24.0 ZT4-7 50.3 50.3 50.3 ZT8-11 16.5 16.5 16.5 ZT12-15 55.3 55.3 55.3 ZT16-19 30.75 30.75 30.75 ZT20-23 30.65 30.65 30.65