condition mean min max ZT0-3 50.3 50.3 50.3 ZT4-7 61.2 61.2 61.2 ZT8-11 37.7 37.7 37.7 ZT12-15 44.85 44.85 44.85 ZT16-19 58.15 58.15 58.15 ZT20-23 38.0 38.0 38.0