condition mean min max ZT0-3 7.2 7.2 7.2 ZT4-7 25.2 25.2 25.2 ZT8-11 41.650000000000006 41.650000000000006 41.650000000000006 ZT12-15 14.8 14.8 14.8 ZT16-19 8.3 8.3 8.3 ZT20-23 12.65 12.65 12.65