condition mean min max ZT0-3 22.4 22.4 22.4 ZT4-7 27.2 27.2 27.2 ZT8-11 41.900000000000006 41.900000000000006 41.900000000000006 ZT12-15 33.15 33.15 33.15 ZT16-19 15.5 15.5 15.5 ZT20-23 32.1 32.1 32.1