Increased risk of colorectal neoplasia in inflammatory bowel disease patients with post-inflammatory polyps: A systematic review and meta-analysis

Table 2 Assessment of the quality of studies

Ref.	Selection				Comparability	Outcome
	1	2	3	4	5	6	7	8	Score
de Jong et al[31], 2020	b1	a1	a1	a1	a b2	a1	a1	a1	9
Gu et al[35], 2019	b1	a1	d	a1	a b2	a1	a1	a1	8
Mahmoud et al[32], 2019	b1	a1	a1	a1	a b2	a1	a1	a1	9
Ünal et al[34], 2019	b1	a1	d	a1	a b2	a1	a1	a1	8
Ma et al[36], 2017	d	a1	a1	a1	a b2	d	c	d	5
Jegadeesan et al[37], 2016	a1	a1	b	a1	a b2	a1	a1	a1	8
Lutgens et al[38], 2015	a1	b	b	a1	a b2	a1	a1	a1	7
Badamas et al[40], 2014	a1	a1	b	a1	a b2	a1	a1	b	7
Freire et al[39], 2014	a1	b	b	a1	a b2	e	a1	a1	6
Baars et al[41], 2011	a1	a1	b	a1	a b2	e	a1	a1	7
Velayos et al[29], 2006	a1	a1	b	a1	a b2	a1	a1	a1	8
Rutter et al[14], 2004	a1	a1	b	a1	a b2	a1	a1	a1	8

¹Data expressed as mean ± SD.

²Data expressed as median (range). The quality of studies was assessed using the Newcastle-Ottawa Scale (Supplementary Table 1). A high-quality study required a score of 7 or above.