condition mean min max ZT0-3 38.85 38.85 38.85 ZT4-7 18.4 18.4 18.4 ZT8-11 31.200000000000003 31.200000000000003 31.200000000000003 ZT12-15 51.1 51.1 51.1 ZT16-19 52.95 52.95 52.95 ZT20-23 50.650000000000006 50.650000000000006 50.650000000000006