condition mean min max ZT0-3 18.399250000000002 18.399250000000002 18.399250000000002 ZT4-7 19.9421 19.9421 19.9421 ZT8-11 20.0716 20.0716 20.0716 ZT12-15 21.280900000000003 21.280900000000003 21.280900000000003 ZT16-19 32.48815 32.48815 32.48815 ZT20-23 19.2303 19.2303 19.2303