condition mean min max ZT0-3 24.4224 24.4224 24.4224 ZT4-7 18.399250000000002 18.399250000000002 18.399250000000002 ZT8-11 20.153750000000002 20.153750000000002 20.153750000000002 ZT12-15 19.9732 19.9732 19.9732 ZT16-19 28.7479 28.7479 28.7479 ZT20-23 29.4344 29.4344 29.4344