condition mean min max ZT0-3 8.609105 5.84328 10.423549999999999 ZT4-7 5.65479 5.65479 5.65479 ZT8-11 5.159835 5.159835 5.159835 ZT12-15 7.96201 7.008215 8.915805 ZT16-19 9.296479999999999 9.296479999999999 9.296479999999999 ZT20-23 12.32315 12.32315 12.32315