condition mean min max ZT0-3 9.9013925 9.094845 10.70794 ZT4-7 12.12355 12.12355 12.12355 ZT8-11 18.09245 18.09245 18.09245 ZT12-15 0 0 0 ZT16-19 19.874650000000003 19.874650000000003 19.874650000000003 ZT20-23 15.0651 15.0651 15.0651