condition mean min max ZT0-3 53.25 53.25 53.25 ZT4-7 61.9 61.9 61.9 ZT8-11 75.15 75.15 75.15 ZT12-15 75.5 75.5 75.5 ZT16-19 59.0 59.0 59.0 ZT20-23 47.55 47.55 47.55