condition mean min max ZT0-3 831.3 831.3 831.3 ZT4-7 1838.2 1838.2 1838.2 ZT8-11 1859.8 1859.8 1859.8 ZT12-15 1967.0 1967.0 1967.0 ZT16-19 1596.1 1596.1 1596.1 ZT20-23 1243.15 1243.15 1243.15