The way people think about their disease is the key variable in how well they cope.

The key variable for individual success isn't the country, it's the person.

The support of the population is the key variable.

The key variable in all the counts was the measure of his intent.

Political leadership has been a key variable in managing the epidemic.

But the key variable is the size of the investment.

Which is more important and can we clearly identify the key variable?

The data from final reports filed are summarized in the table of key variables.

"Right now the dollar is the key variable in determining interest rates," he said.