condition mean min max ZT0-3 3.8421700000000003 1.7993 5.501525 ZT4-7 1.959805 1.959805 1.959805 ZT8-11 2.01484 2.01484 2.01484 ZT12-15 1.6276350000000002 1.25668 1.99859 ZT16-19 1.298479 1.298479 1.298479 ZT20-23 3.24912 3.24912 3.24912