condition mean min max ZT0-3 50.9 50.9 50.9 ZT4-7 42.6 42.6 42.6 ZT8-11 56.900000000000006 56.900000000000006 56.900000000000006 ZT12-15 32.75 32.75 32.75 ZT16-19 44.5 44.5 44.5 ZT20-23 40.75 40.75 40.75