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. Author manuscript; available in PMC: 2022 Dec 7.
Published in final edited form as: Environ Sci Technol. 2021 Nov 24;55(23):16001–16010. doi: 10.1021/acs.est.1c04140

Figure 1.

Figure 1.

Type and number of 577 urine samples analyzed in this study from the 2nd (n = 253) and 3rd (n = 324) trimesters of 173 pregnancies. Theoretically, if all women were fully compliant with our sampling protocol (three FMVs and one 24-hour sample for each of the 2nd and 3rd trimesters), the total number of samples available for this present study should be 1,384. After selecting the first FMV as an individual sample and pooling the remaining samples, a total number of 692 samples should remain for analysis: 346 FMVs as an individual sample and 346 pools with 3 composites. Although all women were asked to collect four samples per trimester, many did not. In some cases, samples provided by women as the 2nd trimester sample were later determined as the 3rd trimester sample or vice versa. In other cases, women collected more samples than necessary. Thus, the number of samples included in each of the 203 pools varied based on the number of samples each woman collected.