condition mean min max ZT0-3 74.65 74.65 74.65 ZT4-7 11.5 11.5 11.5 ZT8-11 49.2 49.2 49.2 ZT12-15 81.5 81.5 81.5 ZT16-19 29.85 29.85 29.85 ZT20-23 28.5 28.5 28.5