Table 2.

Comparisons of skin autofluorescence values of the volar forearm, by age group, of three population studies including the present study

	Skin autofluorescence			Number of participants
Age group (years)	Present study	Netherlands	China	Present study	Netherlands	China
20–29	1.61 ± 0.32	1.53 ± 0.30	1.58 ± 0.23	810	62	129
30–39	1.85 ± 0.35	1.73 ± 0.42	1.71 ± 0.26	1403	86	120
40–49	2.01 ± 0.36	1.81 ± 0.36	1.83 ± 0.33	2522	72	152
50–59	2.10 ± 0.38	2.09 ± 0.36	1.95 ± 0.39	2875	64	96
60–69	2.20 ± 0.40	2.46 ± 0.57	1.97 ± 0.38	2247	45	44
70–79	2.31 ± 0.45	2.73 ± 0.55	2.14 ± 0.51	1089	27	39

Data are presented as mean ± standard deviation.