condition mean min max ZT0-3 10.1 10.1 10.1 ZT4-7 41.9 41.9 41.9 ZT8-11 52.75 52.75 52.75 ZT12-15 49.25 49.25 49.25 ZT16-19 74.15 74.15 74.15 ZT20-23 34.45 34.45 34.45