condition mean min max ZT0-3 59.550000000000004 59.550000000000004 59.550000000000004 ZT4-7 46.9 46.9 46.9 ZT8-11 44.099999999999994 44.099999999999994 44.099999999999994 ZT12-15 51.6 51.6 51.6 ZT16-19 58.650000000000006 58.650000000000006 58.650000000000006 ZT20-23 65.9 65.9 65.9