condition mean min max ZT0-3 14.2 14.2 14.2 ZT4-7 17.2 17.2 17.2 ZT8-11 30.95 30.95 30.95 ZT12-15 42.650000000000006 42.650000000000006 42.650000000000006 ZT16-19 65.1 65.1 65.1 ZT20-23 52.5 52.5 52.5