condition mean min max ZT0-3 485.5 485.5 485.5 ZT4-7 766.0 766.0 766.0 ZT8-11 596.2 596.2 596.2 ZT12-15 437.85 437.85 437.85 ZT16-19 381.45000000000005 381.45000000000005 381.45000000000005 ZT20-23 401.75 401.75 401.75