Table 4.

Correlation analysis between the number of PIM according to the proposed tool as the reference method, patient age, the number of chronic diseases, and the number of medicines used according to the sample data.

	Correlation analysis
	The number of PIM according to the proposed tool				The number of medicines				The number of chronic diseases
	Pearson	p-value	Spearman	p-value	Pearson	p-value	Spearman	p-value	Pearson	p-value
Age*	−0.042	0.474	−0.035	0.548	−0.035	0.544			0.055	0.347
The number of chronic diseases*	0.218	<0.001	0.273	<0.001	0.411	<0.001	0.416	<0.001	1
The number of medicine*	0.605	<0.001	0.646	<0.001	1

^*They show normal distribution according to the Skewness–Kurtosis test.