Table 5. Statistics for ANOVA models for birth weight category and 4-year change in hearing, vision, reaction time and fluid IQ.

	Hearing		Vision		Reaction time		Fluid IQ
	df	F	df	F	df	F	df	F
Birth weight category (low, middle, high)	2, 213	0.93	2, 113	0.57	2, 687	0.09	2, 221	2.95
Age	1, 213	1.01	1, 113	0.06	1, 687	5.81*	1, 221	1.47
Sex	1, 213	0.15	1, 113	0.04	1, 687	0.13	1, 221	0.27
Townsend Quintile	3, 213	0.09	3, 113	1.25	3, 687	0.38	3, 221	0.60
Education level	3, 213	1.80	3, 113	1.51	3, 687	2.35	3, 221	1.34
Smoking	2, 213	4.19*	2, 113	2.98	2, 687	0.21	2, 221	1.30
Diabetes	1, 213	0.00	1, 113	1.67	1, 687	0.13	1, 221	2.55
Cardiovascular disease	1, 213	0.01	1, 113	0.27	1, 687	1.53	1, 221	0.04
Cholesterol	1, 213	1.50	1, 113	0.45	1, 687	0.00	1, 221	0.48
Hypertension	1, 213	0.06	1, 113	1.83	1, 687	0.81	1, 221	1.02
Maternal smoking	1, 213	0.34	1, 113	0.00	1, 687	0.01	1, 221	1.46

*p < 0.05.