condition mean min max ZT0-3 59.300000000000004 59.300000000000004 59.300000000000004 ZT4-7 65.1 65.1 65.1 ZT8-11 50.5 50.5 50.5 ZT12-15 54.35 54.35 54.35 ZT16-19 85.0 85.0 85.0 ZT20-23 84.44999999999999 84.44999999999999 84.44999999999999