condition mean min max ZT0-3 61.75 61.75 61.75 ZT4-7 52.8 52.8 52.8 ZT8-11 65.45 65.45 65.45 ZT12-15 66.25 66.25 66.25 ZT16-19 51.85 51.85 51.85 ZT20-23 73.95 73.95 73.95