condition mean min max ZT0-3 18.75 18.75 18.75 ZT4-7 63.9 63.9 63.9 ZT8-11 45.5 45.5 45.5 ZT12-15 53.900000000000006 53.900000000000006 53.900000000000006 ZT16-19 58.2 58.2 58.2 ZT20-23 47.05 47.05 47.05