condition mean min max ZT0-3 24.091975 24.091975 24.091975 ZT4-7 32.496908 32.496908 32.496908 ZT8-11 35.2279525 35.2279525 35.2279525 ZT12-15 39.272695 39.272695 39.272695 ZT16-19 29.974220000000003 29.974220000000003 29.974220000000003 ZT20-23 27.406916 27.406916 27.406916