Table 2.

Association between handedness and neurodevelopmental outcomes by birth group at 7 years of age

	VPT (n = 175)		Term Control (n = 69)
Outcome measure	b (95% CI)^	p ^	b (95% CI)^	p ^	p ^ *
Full scale IQ	0.08 (−0.05, 0.23)	0.22	0.09 (−0.21, 0.38)	0.55	0.10
Reading	0.26 (0.05, 0.47)	0.02	−0.17 (−0.51, 0.18)	0.34	0.04
Spelling	0.26 (0.08, 0.44)	0.005	−0.15 (−0.48, 0.19)	0.38	0.04
Mathematics	0.22 (0.02, 0.42)	0.03	0.05 (−0.24, 0.33)	0.74	0.34
Language	0.19 (−0.01, 0.39)	0.06	−0.01 (−0.27, 0.25)	0.95	0.24
Global motor ability	0.01 (−0.05, 0.02)	0.49	0.05 (−0.02, 0.13)	0.17	0.13
Fine motor skills	0.01 (−0.02, 0.04)	0.53	0.01 (−0.06, 0.08)	0.71	0.94
Gross motor skills	0.01 (−0.06, 0.03)	0.51	0.04 (−0.07, 0.16)	0.46	0.36
Working Memory	0.27 (0.06, 0.49)	0.01	0.06 (−0.38, 0.52)	0.78	0.40
Behavior difficulty	0.01 (−0.08, 0.05)	0.69	0.08 (−0.04, 0.19)	0.20	0.19

^{^}Adjusted for social risk at age 7 years, corrected age at assessment and parental left-handedness

b = regression coefficient; a positive value indicates that a lower score is associated with stronger NRH. If the regression is statistically significant, the 95% CI will not contain 0.

^*p value for the interaction between birth group and handedness