condition mean min max ZT0-3 75.5 75.5 75.5 ZT4-7 49.0 49.0 49.0 ZT8-11 68.6 68.6 68.6 ZT12-15 61.6 61.6 61.6 ZT16-19 69.5 69.5 69.5 ZT20-23 86.55 86.55 86.55