condition mean min max ZT0-3 91.632878185 79.16968555 104.09607082 ZT4-7 75.8956510525 63.7874237 88.003878405 ZT8-11 28.1242596025 23.713332725 32.53518648 ZT12-15 29.5917663225 26.14251146 33.041021185 ZT16-19 41.237176955 40.89750551 41.5768484 ZT20-23 38.230512235000006 35.70850497 40.752519500000005