condition mean min max ZT0-3 41.8 41.8 41.8 ZT4-7 11.3 11.3 11.3 ZT8-11 59.9 59.9 59.9 ZT12-15 43.650000000000006 43.650000000000006 43.650000000000006 ZT16-19 26.75 26.75 26.75 ZT20-23 81.15 81.15 81.15