condition mean min max ZT0-3 568.7 568.7 568.7 ZT4-7 919.6 919.6 919.6 ZT8-11 893.45 893.45 893.45 ZT12-15 838.2 838.2 838.2 ZT16-19 773.0 773.0 773.0 ZT20-23 611.4 611.4 611.4