Table 1.

Intraindividual variability in the PAX/CAF ratio in young and elderly healthy subjects.

	PAX/CAF ratio (MR)	CV (%)	Lowest MR	Highest MR	Highest/lowest MR
Young subjects
1	0.36 ± 0.09	25.7	0.25	0.49	1.96
2§	0.84 ± 0.16	18.9	0.62	1.03	1.66
3	0.42 ± 0.05	11.0	0.37	0.49	1.32
4§	0.98 ± 0.26	26.5	0.63	1.35	2.14
5§	0.72 ± 0.17	23.7	0.42	0.83	1.98
6	0.41 ± 0.09	21.7	0.31	0.54	1.74
7	0.20 ± 0.04	21.0	0.16	0.25	1.56
8§	0.49 ± 0.09	18.2	0.41	0.61	1.49
9	0.23 ± 0.05	21.4	0.16	0.29	1.81
10	0.4 ± 0.06	15.3	0.33	0.49	1.48
11§	0.87 ± 0.16	18.8	0.64	1.03	1.61
12	0.43 ± 0.09	19.9	0.31	0.52	1.68
13	0.58 ± 0.05	8.0	0.52	0.64	1.23
14	0.31 ± 0.02	6.9	0.29	0.34	1.17
15	0.45 ± 0.06	12.7	0.36	0.5	1.39
16	0.69 ± 0.08	12.3	0.58	0.77	1.33
All subjects	0.52 ± 0.25	17.6 ± 6.0*			1.60 ± 0.28
Elderly subjects
1§	0.39 ± 0.04	10.4	0.35	0.44	1.26
2	0.58 ± 0.09	15.2	0.47	0.7	1.49
3	0.23 ± 0.03	15.1	0.20	0.29	1.45
4	0.32 ± 0.03	8.6	0.29	0.36	1.24
5	0.15 ± 0.03	20.5	0.11	0.19	1.73
6	0.37 ± 0.12	32.9	0.29	0.58	2.00
7	0.27 ± 0.03	10.2	0.25	0.32	1.28
8	0.34 ± 0.06	16.1	0.25	0.39	1.56
9	0.24 ± 0.05	21.0	0.20	0.33	1.65
10§	0.53 ± 0.09	16.9	0.44	0.62	1.41
11§	0.42 ± 0.08	18.5	0.33	0.52	1.58
12	0.50 ± 0.10	20.3	0.35	0.62	1.77
13	0.10 ± 0.01	10.7	0.09	0.12	1.33
14	0.46 ± 0.06	14.2	0.38	0.53	1.39
15	0.23 ± 0.03	13.4	0.20	0.28	1.4
16	0.32 ± 0.05	15.4	0.26	0.39	1.5
All subjects	0.34 ± 0.14	16.2 ± 5.9*			1.50 ± 0.21

Data are expressed as mean value±s.d. MR is the mean value of five consecutive measures over a 12 week period.

^*Intraindividual CV was similar among young and elderly subjects.

^§smokers.