condition mean min max ZT0-3 0.9787016752500001 0.44012114 1.5172822105000001 ZT4-7 3.5175910092500002 2.8998427825000004 4.135339236 ZT8-11 4.875349357999999 4.5793879754999995 5.1713107405 ZT12-15 4.332844116 4.1704619415 4.4952262905 ZT16-19 1.712802372 1.622581223 1.803023521 ZT20-23 2.4280753135 2.079921563 2.776229064