condition mean min max ZT0-3 39.40931666666667 30.530250000000002 54.278949999999995 ZT4-7 75.29939999999999 75.29939999999999 75.29939999999999 ZT8-11 55.81505 55.81505 55.81505 ZT12-15 45.632025 41.9716 49.29245 ZT16-19 34.68705 34.68705 34.68705 ZT20-23 44.7348 44.7348 44.7348