Premise: The 25th Emmy Awards, later known as the 25th Primetime Emmy Awards, were handed out on May 20, 1973. The ceremony was hosted by Johnny Carson. This would be the final ceremony that included daytime categories, as the Daytime Emmy Awards premiered the next year. Winners are listed in bold and series' networks are in parentheses.
Hypothesis: Johnny Carson only hosted at the Emmy Awards when there were daytime categories.