Table 4.

OLS Estimates of the E3 ect of Handedness on Test Scores

Variable	Log WAI (1)		Log PPVT (2)
	ME	t Statistic	ME	t Statistic
Basic Specification
Left-handed	−0.026	−2.74	0.005	0.51
Mixed-handed	−0.083	−6.04	−0.023	−1.55
Age 5	0.126	16.98	0.056	6.68
Male	−0.116	−20.71	−0.031	−5.07
R2	0.141		0.017
Extended Specification
Left-handed	−0.023	−2.52	0.005	0.55
Mixed-handed	−0.075	−5.63	−0.014	−1.05
Age 5	0.127	17.62	0.057	7.54
Male	−0.119	−21.68	−0.034	−5.97
Birth weight	0.027	4.92	0.019	3.34
Intensive care when born	−0.016	−1.83	−0.002	−0.20
Premature birth	−0.015	−1.43	−0.011	−1.05
Multiple birth	−0.030	−1.73	−0.085	−4.68
Older sibling in household	0.011	1.36	0.003	0.31
Younger sibling in household	0.025	3.19	0.017	2.17
Number of siblings	−0.024	−6.25	−0.033	−8.35
Mother’s age	0.002	2.78	0.003	5.36
Father’s age	0.000	0.06	0.000	0.40
Mother has a degree	0.023	3.39	0.043	6.09
Father has a degree	0.037	5.01	0.027	3.50
Mother works full-time	0.018	2.18	−0.008	−0.92
Father works full-time	0.015	2.25	0.014	1.98
Single mother	0.000	−0.02	−0.054	−3.02
English is second language	0.033	4.26	−0.157	−19.07
Income $400–$599 per week	−0.003	−0.19	0.012	0.75
Income $600–$799 per week	−0.008	−0.56	0.053	3.34
Income $800–$999 per week	−0.001	−0.05	0.052	3.14
Income $1,000–$1,499 per week	0.010	0.70	0.062	3.97
Income $1,500–$1,999 per week	0.017	1.10	0.076	4.62
Income > $2,000 per week	0.017	1.07	0.079	4.68
R2	0.201		0.194
Sample Size	4,868		4,355

Notes: The omitted (base) categories are age 4, female, not in intensive care when born, not a premature birth, not part of a multiple birth, mother/father has less than a degree-level qualification, mother/father does not work full-time, both parents in household, English is first language, and household income is less than $400 per week. Each model also has controls for missing observations on household income, birth weight, and parental characteristics.