Table 5. HCL-32 score and childhood IQ^a,b.

IQ category	Full-scale IQ		Verbal IQ		Performance IQ
	Regression coefficient (95% CI)	P	Regression coefficient (95% CI)	P	Regression coefficient (95% CI)	P
>69	−7.00 (–11.79 to –2.19)	0.004	−9.43 (–17.34 to –1.51)	0.020	−3.80 (–8.74 to 1.14)	0.132
70–79	−8.01 (–12.50 to –3.52)	0.001	−5.85 (–11.54 to –0.16)	0.044	−2.72 (–5.91 to 0.48)	0.095
80–89	−3.59 (–6.07 to –1.11)	0.005	−4.93 (–7.53 to –2.33)	0.001	−0.57 (–2.45 to 1.31)	0.552
90–109	Referent group
110–119	0.15 (–1.27 to 1.57)	0.837	0.61 (–0.89 to 2.11)	0.423	0.82 (–0.68 to 2.33)	0.285
120–129	2.31 (0.56 to 4.07)	0.010	2.33 (0.76 to 3.91)	0.004	2.07 (0.36 to 3.77)	0.018
≥130	1.87 (0.19 to 3.56)	0.029	1.77 (–0.003 to 3.54)	0.050	2.00 (–0.02 to 4.02)	0.052

^a100 imputed data-set created.

^bAdjusted for gender, ethnicity, maternal social class, maternal age >40, maternal education, maternal history of depression, child left-handedness, version of questionnaire.