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. 2019 Dec 31;14(12):e0226811. doi: 10.1371/journal.pone.0226811

Table 2. Piecewise regression models assessing the relationships between X = FMRP level (normalized to normal controls) and Y = IQ, and estimated FMRP levels corresponding to IQ = 85 and 70.

IQ Measure	FMRP below -1SD					FMRP above -1SD
	Fitted Regression Model	P-value	R² value	Estimated FMRP levels		Fitted Regression Model	P-value	R² value
	Fitted Regression Model	P-value	R² value	IQ = 70	IQ = 85	Fitted Regression Model	P-value	R² value
Full Scale IQ	FSIQ = 54.48 + 88.97 FMRP	< 0.0001	0.481	0.174	0.343	FSIQ = 111.24–2.78 FMRP	0.6326	0.0021
Performance IQ	PIQ = 55.90 + 83.32 FMRP	< 0.0001	0.5063	0.169	0.349	PIQ = 105.45–0.48 FMRP	0.9274	0.0001
Verbal IQ	VIQ = 65.13 + 78.68 FMRP	<0.0001	0.3965	0.062	0.252	VIQ = 116.72–3.36 FMRP	0.5502	0.0033