condition mean min max ZT0-3 52.528 48.2386 56.8174 ZT4-7 34.8014 34.8014 34.8014 ZT8-11 23.45185 23.45185 23.45185 ZT12-15 0 0 0 ZT16-19 40.23005 40.23005 40.23005 ZT20-23 41.8637 41.8637 41.8637