Table 5.

Sensitivity, specificity, and positive predictive value of a trimester-specific urinary paraben concentration to predict the highest tertile of the GM gestational urinary paraben concentration.^a

Trimesterb	nb	MP			PP			BP
		Sensitivity	Specificity	PPV	Sensitivity	Specificity	PPV	Sensitivity	Specificity	PPV
1st	120	0.73	0.86	0.73	0.63	0.82	0.65	0.70	0.85	0.70
2nd	121	0.73	0.86	0.73	0.73	0.86	0.73	0.73	0.86	0.73
3rd	86	0.64	0.79	0.55	0.63	0.80	0.59	0.83	0.93	0.86
aThe gold standard is the GM gestational urinary paraben concentration (2–3 urine samples per subject). Classification probabilities are based on the highest versus two lowest tertiles of gestational or trimester-specific urinary paraben concentrations. bThere is a maximum of one urine sample included per subject per trimester; n = 126 women included in analysis.