condition mean min max ZT0-3 30.5 30.5 30.5 ZT4-7 55.7 55.7 55.7 ZT8-11 51.1 51.1 51.1 ZT12-15 45.650000000000006 45.650000000000006 45.650000000000006 ZT16-19 16.25 16.25 16.25 ZT20-23 34.8 34.8 34.8