condition mean min max ZT0-3 528.305634 528.305634 528.305634 ZT4-7 481.7211765 481.7211765 481.7211765 ZT8-11 598.720811 598.720811 598.720811 ZT12-15 639.0134475 639.0134475 639.0134475 ZT16-19 617.2422835 617.2422835 617.2422835 ZT20-23 651.664137 651.664137 651.664137