condition mean min max ZT0-3 62.18538333333333 37.8886 77.4482 ZT4-7 31.828400000000002 31.828400000000002 31.828400000000002 ZT8-11 31.121850000000002 31.121850000000002 31.121850000000002 ZT12-15 48.04635 45.42975 50.662949999999995 ZT16-19 60.79514999999999 60.79514999999999 60.79514999999999 ZT20-23 93.2948 93.2948 93.2948