condition mean min max ZT0-3 1.0397635 1.0397635 1.0397635 ZT4-7 7.38866 7.38866 7.38866 ZT8-11 8.79409 8.79409 8.79409 ZT12-15 7.040135 7.040135 7.040135 ZT16-19 0.8868469999999999 0.8868469999999999 0.8868469999999999 ZT20-23 0.2316325 0.2316325 0.2316325