The Mann-Whitney is a test that two populations have the same location. As with other statistics, the ultimate result of the test can be quoted as a significance level. In most literature it suffices to indicate either which of the so-called 'standard' levels (0.01 or 0.05) the result exceeded (if it did) or the actual calculated significance level. If M-W shows significant difference then you can discuss the meaning of the difference in location or central tendencybetween the two populations you have considered.
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