Table 2.

Relationship between measurements of AFI and HFUPR in individuals with repeat measurements at various time intervals. Data are presented as correlation coefficient (R) and P values, n = number of measurements.

Median interval (days)	Range (days)	n	AFI at time 1 versus AFI at time 2		HFUPR at time 1 versus HFUPR at time 2		HFUPR at time 1 versus AFI at time 2
			R	P	R	P	R	P
3	1–4	16	0.84	<0.0001	0.21	NS	−0.34	NS
7	5–7	24	0.55	<0.005	−0.27	NS	0.03	NS
10	8–13	20	0.53	<0.02	−0.07	NS	0.25	NS
17	14–21	16	0.51	<0.05	−0.17	NS	−0.29	NS