condition mean min max ZT0-3 2103.1 2103.1 2103.1 ZT4-7 1841.7 1841.7 1841.7 ZT8-11 1845.3000000000002 1845.3000000000002 1845.3000000000002 ZT12-15 1692.3 1692.3 1692.3 ZT16-19 1879.6 1879.6 1879.6 ZT20-23 2046.75 2046.75 2046.75