condition mean min max ZT0-3 169.3 169.3 169.3 ZT4-7 57.0 57.0 57.0 ZT8-11 57.650000000000006 57.650000000000006 57.650000000000006 ZT12-15 31.200000000000003 31.200000000000003 31.200000000000003 ZT16-19 59.2 59.2 59.2 ZT20-23 71.45 71.45 71.45