condition mean min max ZT0-3 27.5 27.5 27.5 ZT4-7 63.7 63.7 63.7 ZT8-11 34.5 34.5 34.5 ZT12-15 47.650000000000006 47.650000000000006 47.650000000000006 ZT16-19 30.6 30.6 30.6 ZT20-23 38.7 38.7 38.7