condition mean min max ZT0-3 51.8 51.8 51.8 ZT4-7 8.4 8.4 8.4 ZT8-11 29.25 29.25 29.25 ZT12-15 79.9 79.9 79.9 ZT16-19 68.8 68.8 68.8 ZT20-23 52.15 52.15 52.15