Table 2. Urine:Serum (U:S) total concentration ratios for chemicals present in the serum of 50% of participants.

Participant	Methyl Paraben		Propyl Paraben
	Visit 1 U:S Ratio	Visit 2 U:S Ratio	Visit 3 U:S Ratio	Visit 4 U:S Ratio
1	17	62	22	18
2	22	22	54	20
4	231	43	580	355
5	49	130	<1	<1
6	54	128	100	135
7	429	27	178	35
8	473	22	414	14
9	82	92	31	<1
10	2	4	3	6
11	16	5	23	8
13	28	141	97	25
14	24	68	19	96
15	39	28	11	16
17	38	13	98	3
18	131	21	681	29
19	23	40	7	2
20	265	970	652	242
21	49	13	226	33
22	9	3	15	<1
24	40	2	57	2
25	193	203	418	279
26	104	92	304	246
27	217	135	265	129
28	286	50	470	20
29	312	6081	406	85
30	64	25	18	4
31	39	88	117	347
32	67	67	3	84
33	24	68	25	116
34	11	4	1	4