Construction Formula of Biological Age Using the Principal Component Analysis

Table 4

Correlation coefficients and redundancy coefficients of each research.

Researcher	Year	Correlation coefficient	Redundancy coefficient
Nakamura et al. [17]	1989	0.24	0.5
Ueno et al. [20]	2003	0.25	0.9
Nakamura and Miyao [21]	2007		0.6
Nakamura and Miyao [22]	2008		0.6
Park et al. [23]	2009	0.15
Bai et al. [12]	2010	0.25	0.4
Jee et al. [11]	2012	0.12	0.75
Zhang et al. [24]	2014	0.40	0.7
Zhang et al. [25]	2014	0.15	0.7