condition mean min max ZT0-3 3.28185 3.28185 3.28185 ZT4-7 3.210635 3.210635 3.210635 ZT8-11 3.21054 3.21054 3.21054 ZT12-15 3.364655 3.364655 3.364655 ZT16-19 4.44689 4.44689 4.44689 ZT20-23 3.4535 3.4535 3.4535