. 2018 Mar 16;126(3):037005. doi: 10.1289/EHP1994

Table 2.

Within-day variability – descriptive statistics of the non-transformed biomarker concentrations ( $μ g / L$ ) for the unpooled spot samples from subgroup 1 (2 women, $n = 114$ spot samples collected over the first week of collection), and ICCs based on $\log_{10} -transformed$ phenol biomarker concentrations, creatinine concentration, and specific gravity. Values were not standardized for creatinine or specific gravity.

Biomarker	LOD ( $μ g / L$ )	Results above the LOD, N (%)	Percentiles					Within-day ICC (95% CI)^a
Biomarker	LOD ( $μ g / L$ )	Results above the LOD, N (%)	5th	25th	50th	75th	95th	Within-day ICC (95% CI)^a
Phenols ( $μ g / L$ )^b
2,4-Dichlorophenol	0.1	113 (99)	0.1	0.2	0.3	0.3	0.5	0.12 (0.00, 0.28)
2,5-Dichlorophenol	0.1	111 (97)	0.1	0.2	0.4	0.7	1.2	0.11 (0.00, 0.27)
Butyl paraben	0.1	113 (99)	0.1	1.1	4.2	21.7	92.7	0.10 (0.00, 0.25)
Ethyl paraben	1.0	105 (92)	$< LOD$	2.4	10.7	43.1	126.2	0.03 (0.00, 0.15)
Methyl paraben	1.0	114 (100)	37	90.4	217.3	1329.4	5000.0	0.27 (0.05, 0.49)
Propyl paraben	0.1	114 (100)	0.8	4.8	36.7	139.0	895.1	0.28 (0.05, 0.50)
Benzophenone-3	0.2	31 (27)	$< LOD$	$< LOD$	$< LOD$	1.4	10.7	0.26 (0.04, 0.48)
Bisphenol A	0.1	113 (99)	0.3	0.9	1.6	2.4	7.5	0.21 (0.01, 0.41)
Bisphenol S	0.1	112 (98)	0.1	0.2	0.3	0.5	1.3	0.50 (0.26, 0.73)
Triclosan	1.0	90 (79)	$< LOD$	1.0	2.1	3.3	4.8	0.30 (0.08, 0.53)
Urine dilution markers
Creatinine (mg/dL)	NA	114 (100)	37.2	72.5	102.5	139.2	223.1	0.10 (0.00, 0.26)
Specific gravity	NA	114 (100)	1.009	1.014	1.018	1.021	1.027	0.03 (0.00, 0.15)

Note: CI, confidence interval; ICC, intraclass correlation coefficient; LOD, limit of detection; NA, not applicable.

^{^a}

ICCs were estimated from ANOVA with a random effect on day (14 d) and within-woman mean-centering of the log-transformed phenols concentrations.

^{^b}

Concentrations below the LOD were replaced by instrumental reading values. For each phenol biomarker, instrumental reading values equal to 0 were replaced by the lowest non-zero instrumental reading value divided by the square root of 2.