condition mean min max ZT0-3 2221.55 2221.55 2221.55 ZT4-7 2397.1 2397.1 2397.1 ZT8-11 2074.85 2074.85 2074.85 ZT12-15 1893.3000000000002 1893.3000000000002 1893.3000000000002 ZT16-19 1952.15 1952.15 1952.15 ZT20-23 1962.7 1962.7 1962.7