condition mean min max ZT0-3 51.1 51.1 51.1 ZT4-7 28.5 28.5 28.5 ZT8-11 53.1 53.1 53.1 ZT12-15 69.1 69.1 69.1 ZT16-19 89.45 89.45 89.45 ZT20-23 102.15 102.15 102.15