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

Table 4 Subgroup analysis summary table of mothers’ education years ≥ 12 years vs < 12 years

Analysis specification	Z	OR	95%CI	P value	I2
All	1.56	0.78	0.57-1.07	0.119	91.7%
China	4.21	0.59	0.46-0.75	< 0.001	81.2%
Other	0.68	1.25	0.66-2.40	0.495	92.3%
Multicenter	1.52	0.67	0.41-1.12	0.128	94.2%
Single	0.11	0.97	0.59-1.61	0.912	86.2%

OR: Odds ratio; CI: Confidence interval.