When reporting the results of a $t$-test using APA style, the format includes the $t$ symbol, degrees of freedom, the calculated $t$ value, and the $p$-value. For instance, a result might be written as: $t(9) = -3.07, p = .01$. In this format, the $t$ and $p$ are italicized, the degrees of freedom appear in parentheses without any decimal remainder, and both the $t$ score and $p$-value are rounded to two decimal places.