Table 2.

Risk of bias for studies assessing potential risk factors for the progression of finger interphalangeal joint osteoarthritis, assessed using a modified Quality in Prognosis Studies (QUIPS) tool

Authors	Biasesa					Overall risk of bias
	1	2	3	4	5
Plato et al. [35]	High	High	Moderate	Moderate	High	High
Kallman et al. [33]	High	High	Low	Low	Moderate	High
Busby et al. [34]	Moderate	Moderate	Low	Moderate	High	High
Kalichman et al. [39]	Moderate	Low	Moderate	Moderate	High	High
Kalichman et al. [40]	High	High	Moderate	Low	Moderate	High
Hoeven et al. [36]	Moderate	Low	Moderate	Low	Moderate	Moderate
Haugen et al. [37]	High	High	Moderate	Moderate	Moderate	High
Marshall et al. [38]	Moderate	High	Low	Moderate	Low	High

^aBiases from modified Quality in Prognosis Studies (QUIPS) tool: (1) study participation; (2) study attrition; (3) prognostic factor measurement; (4) outcome measure; (5) statistical analysis and reporting