The only numbers that will truly matter in the Iowa caucuses on Monday will be the number of votes tallied for Donald J. Trump, Ron DeSantis, Nikki Haley and Vivek Ramaswamy.

But there are a number of, well, numbers that help explain the Republican nominating contest. In most polls, Mr. Trump holds a solid lead, while Ms. Haley and Mr. DeSantis are battling it out far behind in a fight for second place.

Here are seven numbers that show how we got here — and what comes next.

Mr. Trump’s lead in the Iowa Poll

The bar has been set.

In the Iowa Poll released on Saturday evening by The Des Moines Register, NBC News and Mediacom, Mr. Trump was winning 48 percent of likely caucusgoers. It’s a dominant showing that’s more than the total support measured for Ms. Haley (20 percent) and Mr. DeSantis (16 percent) combined.