condition mean min max ZT0-3 82.7 82.7 82.7 ZT4-7 57.0 57.0 57.0 ZT8-11 49.099999999999994 49.099999999999994 49.099999999999994 ZT12-15 64.0 64.0 64.0 ZT16-19 137.10000000000002 137.10000000000002 137.10000000000002 ZT20-23 62.75 62.75 62.75