condition mean min max ZT0-3 1431.8 1431.8 1431.8 ZT4-7 2020.0 2020.0 2020.0 ZT8-11 1968.3000000000002 1968.3000000000002 1968.3000000000002 ZT12-15 2186.2 2186.2 2186.2 ZT16-19 1861.0500000000002 1861.0500000000002 1861.0500000000002 ZT20-23 1658.45 1658.45 1658.45