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

Table 3 Assessment of quality of studies by the Newcastle-Ottawa scale

Ref.	Selection			Comparability			Outcome			Score
	1	2	3	4	5a	5b	6	7	8
Kong et al[25], 2024	1	1		1	1		1	1	1	7
Perapoch et al[27], 2021	1	1	1	1	1	1	1	1	1	9
Bora et al[28], 2014	1	1	1	1	1	1	1		1	8
Cherkes-Julkowski[26], 1998	1	1	1	1	1	1		1	1	8
Huang et al[16], 2018	1	1	1	1	1	1	1	1	1	9
St Sauver et al[33], 2004	1	1	1		1	1	1		1	7
Rydell[32], 2010	1	1	1	1	1	1	1	1	1	9
Chen et al[29], 2024		1	1	1	1	1	1		1	7
Hsu et al[31], 2022	1		1		1	1			1	5
Yan et al[35], 2018	1		1	1	1	1		1	1	7
Cochran et al[30], 2022	1	1	1	1	1	1	1	1	1	9
van Dyk et al[34], 2015		1	1	1	1	1			1	6

1: The exposed cohort is representative; 2: Study cohort with unexposed; 3: Exposure factor identified; 4: No positive results at the start of the study; 5: Cohort comparability based on design or analysis (a: Study age controls; b: Study controls for any additional factors); 6: Outcome assessment is reliable; 7: Follow-up time is long enough; 8: Adequacy of cohort follow-up.