condition mean min max ZT0-3 43.5 43.5 43.5 ZT4-7 9.8 9.8 9.8 ZT8-11 38.650000000000006 38.650000000000006 38.650000000000006 ZT12-15 43.35 43.35 43.35 ZT16-19 49.099999999999994 49.099999999999994 49.099999999999994 ZT20-23 70.9 70.9 70.9