Table 2.

Results from GLMMs examining differences in log-transformed mass (g) between exposure treatments and the control (intercept) in the chronic exposure study of Rana pipiens tadpoles exposed to PFBA and PFHxA

		n	ß coef	SE	df	t-value	p-value	Variance	SD
PFBA
Model 3: logMass ~ Treatment + SVL + Stage + Stage ^ 2 + Stage ^ 3 + (1 | Tank), n = 247
Fixed Effects	(Intercept - Control)	50	9.273	1.869	230.2	4.963	< 0.001
	0.1 µg/L	40	0.042	0.018	24.8	2.374	0.026
	1 µg/L	38	0.049	0.018	25.4	2.747	0.011
	10 µg/L	39	0.043	0.018	24.8	2.424	0.023
	100 µg/L	40	0.037	0.018	24.6	2.068	0.049
	1000 µg/L	40	0.021	0.018	24.7	1.151	0.261
	SVL		0.051	0.002	237.7	25.636	<0.001
	Stage		−0.996	0.158	230.2	−6.303	<0.001
	Stage^2		0.031	0.004	230.3	7.077	<0.001
	Stage^3		−3.21 × 10−4	4.108 × 10−5	230.4	−7.815	<0.001
Random Effects	Tank							< 0.001	0.022
	Residual							0.002	0.045
PFHxA
Model 4: logMass ~ Treatment + SVL + Stage + Stage ^ 2 + Stage ^ 3 + (1 | Tank), n = 246
Fixed Effects	(Intercept - Control)	50	5.830	1.450	231.4	4.021	< 0.001
	0.1 µg/L	40	0.062	0.022	25.1	2.833	0.009
	1 µg/L	39	0.056	0.022	24.9	2.568	0.017
	10 µg/L	38	0.052	0.022	25.8	2.366	0.026
	100 µg/L	40	0.024	0.022	24.7	1.102	0.281
	1000 µg/L	39	0.039	0.022	25.2	1.774	0.088
	SVL		0.050	0.002	230.0	24.354	< 0.001
	Stage		−0.702	0.125	231.1	−5.628	< 0.001
	Stage^2		0.023	0.004	230.9	6.493	< 0.001
	Stage^3		−2.426 × 10−4	3.336 × 10−5	230.8	−7.273	< 0.001
Random Effects	Tank							< 0.001	0.028
	Residual							0.003	0.050

Treatment, snout-to-vent length (SVL) (mm), and Gosner stage of development (Stage) were included as fixed effects, and tank was included as a random effect. Significant results are in bold