condition mean min max ZT0-3 34.85 34.85 34.85 ZT4-7 18.9 18.9 18.9 ZT8-11 50.5 50.5 50.5 ZT12-15 49.5 49.5 49.5 ZT16-19 63.25 63.25 63.25 ZT20-23 72.7 72.7 72.7