Table 2.

Actual measurements of dialysate deuterium abundance during each peritoneal exchange and the difference (residual) between these and values obtained from curve-fitting used to obtain rate constants

	Deuterium abundance ppm
Time minutes	Subject 1		Subject 2		Subject 3		Subject 4		Subject 5
	Actual	R	Actual	R	Actual	R	Actual	R	Actual	R
Previous equilibrated exchange	578		588		517		582		512
15	216	−1	219	−5	260		272		224	−2
20	258	−3	266	7	284	1	293	1	254	−3
25	289	2	289	−2	303	−2	317	0	283	0
30	318	1	318	−1	324	−1	340	0	305	0
35	344	1	348	3	345	2	359	−1	327	2
45	390	2	389	0	371	−2	391	−5	361	2
60	442	4	434	−5	409	1	443	4	392	−3
90	496	−3	505	4	452	1	501	5	436	−5
120	522	−7	534	0	471	−3	526	−2	466	0
150	543	−2	550	−1	488	3	542	−5	481	−1
180	554	2	556	−4	490	−1	560	3	499	5
240	563	5	572	4	496	0	567	0	505	−5

R is residual.