condition mean min max ZT0-3 52.650000000000006 52.650000000000006 52.650000000000006 ZT4-7 12.9 12.9 12.9 ZT8-11 42.5 42.5 42.5 ZT12-15 31.900000000000002 31.900000000000002 31.900000000000002 ZT16-19 34.15 34.15 34.15 ZT20-23 39.5 39.5 39.5