Nitrogen-containing bisphosphonate for vascular calcification: animal experiments, systematic review and meta-analysis

Table 4 Quality assessment of non-randomized control trial

Studies	Selection	Comparability	Outcome	Score
Hill(2002)	\( \star \star \star \star \)	\( \star \)	\( \star \star \)	7
Okamoto(2014)	\( \star \star \star \star \)	\( \star \)	\( \star \star \)	7

The Cohort studies were evaluated using the Newcastle-Ottawa scale, which are comprised of the study of selection (Representativeness of the exposed group, Representativeness of the non exposed group, Ascertainment of exposure, Demonstration that outcome of interest was not present at start of study), group comparability(Controls for the most important factor, Controls for any additional factor), outcome measures (Assessment of outcome, Was follow-up long enough for outcomes to occur, Adequacy of follow up of cohorts), a total of nine points. \( \star \), 1 point

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