Association of premature birth and maternal education level on attention deficit hyperactivity disorder in children: A meta-analysis

Table 5 Summary of publication bias

Intervention measure	Item	Incorporate literature	t	P value	95%CI
Premature	Premature vs term	4	0.67	0.570	-3.02 to 4.13
Education level of mother	≥ 12 years vs < 12 years	8	0.57	0.591	-4.91 to 7.88
	≥ 12 years vs < 9 years	6	-0.13	0.905	-4.90 to 4.49
	≥ 12 years vs < 9 years1	3	-3.29	0.188	-10.13 to 5.96
	≥ 12 years vs 9-12 years	6	-0.93	0.405	-10.85 to 5.41
	9-12 years vs < 9 years	4	-1.28	0.330	-9.43 to 5.11

¹Eliminate the literature with great heterogeneity

CI: Confidence interval.