condition mean min max ZT0-3 10.55 10.55 10.55 ZT4-7 19.3 19.3 19.3 ZT8-11 11.6 11.6 11.6 ZT12-15 42.75 42.75 42.75 ZT16-19 41.900000000000006 41.900000000000006 41.900000000000006 ZT20-23 113.25 113.25 113.25