condition mean min max ZT0-3 60.3 60.3 60.3 ZT4-7 42.0 42.0 42.0 ZT8-11 60.75 60.75 60.75 ZT12-15 34.3 34.3 34.3 ZT16-19 41.650000000000006 41.650000000000006 41.650000000000006 ZT20-23 55.55 55.55 55.55