condition mean min max ZT0-3 8.200048381750001 6.477365611500001 9.922731152 ZT4-7 7.9608716600000005 7.888649901000001 8.033093419 ZT8-11 6.9194676565 5.629941045000001 8.208994268 ZT12-15 5.34091037525 4.1136332515 6.568187499 ZT16-19 9.598785086 7.357191521999999 11.840378650000002 ZT20-23 8.63404885725 8.074763983 9.1933337315