The Influence of Reducing Disease Activity Score on Cervical Spine Deformity in Rheumatoid Arthritis: A Systematic Review

Table 2

Risk of bias in the studies.

Study	Score on risk of bias scale	Well-defined patient group	Absence of selection bias	Absence of allocation bias	Absence of attrition bias
Neva (2000) [18]	++++	+	+	+	+
Kauppi (2009) [19]	+++	+	+	+	-
Kanayama (2010) [6]	++	+	-	+	-
Blom (2013) [20]	++	+	+	-	-
Kaito (2019) [16]	++	+	-	-	+
Horita (2019) [21]	++	+	-	-	+
Sandstrom (2020) [22]	+++	+	-	+	+
Neva (2003) [24]	++	+	-	-	+
Younes (2009) [23]	++	+	-	-	+
Takahashi (2014) [7]	++	+	-	-	+
Zoli (2011) [25]	++++	+	+	+	+
Carotti (2019) [26]	++++	+	+	+	+