Table 3.

Changes in levels of PBDEs and PCBs in ST and LT studies.

Study	Congener	Change per month (%)a	95% CIa	p-Valueb	p-Valuec
ST	BDE-47	−3	−2 to −4	10−11	0.89
	BDE-99	−2	−0.2 to −3.5	0.03	0.11
	BDE-100	−2	−1 to −3	0.0003	1
	BDE-153	−2	−1 to −3	0.001	0.36
	PCB-153d	0.3	−2 to 2	0.97	NA
	PCB-153e	−0.6	−3 to 2	0.40	0.001
LT	BDE-47	−1	−0.1 to −2	0.03	< 0.0001
	PCB-153	−1	−0.5 to −1.6	0.0001	0.07

NA, not applicable.

^aDeclines per month and 95% CIs are fixed slope estimates. With a random slope model, the estimate of the mean slope is identical to this fixed slope estimate (using the reported significant figures), except for PCB-153. For PCB-153, fixed slope estimates and mean random slope estimates are given separately.

^bp-Value for test of zero slope using fixed slope/random intercept model.

^cp-Value for the test of homogeneity of slopes in random intercept/random slope model. These p-values are conservative; Snijders & Bosker (1999) suggest dividing the p-value by 2 to address this conservativeness.

^dFixed slope estimate.

^eRandom slope estimate.