Table 2. Quality assessment of prospective cohort studies included in the systematic review.

Study, year(reference)	Study Participation	Study Attrition	Prognostic Factor Measurement	Outcome Measurement	Confounding	Analysis	Variables that were Adjusted for
Mottaghi et al., 2015	Yes	Partly	Yes	Yes	Partly	Partly	basic Scr, age, sex, smoking, hypertension, and abdominal obesity
Panwar et al., 2015	Partly	No	Yes	Yes	Yes	Yes	age, race, sex, geographic region of residence, education, income, physical activity, current smoking, history of coronary heart disease, and history of stroke
Junk et al., 2015	Yes	Partly	Yes	Partly	Yes	Partly	age and sex, baseline glomerular filtration rate, history of cardiovascular disease, drinking, smoking, and exercise habits. alanine aminotransferase, γ-glutamyltransferase, low-density lipoprotein cholesterol, uric acid, and high-sensitivity C-reactive protein
Song et al., 2015	Partly	Partly	Yes	Partly	Yes	Partly	sex, alcohol use, smoking amount, and physical activity at baseline, household and sibling effects and sex
Nishikawa et al., 2015	Yes	Partly	Yes	Partly	Yes	Unclear	age, sex, smoking status, alcohol consumption, exercise habits, walking time in commutation, type of work and occupational exposure, C-reactive protein
Hashimoto et al., 2015	Partly	Partly	Yes	Partly	Partly	Yes	age, sex, smoking statues, alcohol use
Chang et al., 2016	Yes	Partly	Yes	Yes	Yes	Yes	age, sex, study center, and year of screening examination, smoking status, alcohol intake, and regular exercise
Cao et al., 2015	Yes	Partly	Yes	Yes	Yes	Yes	age, sex, smoking, plasma low-density lipoprotein cholesterol level, medication use, and physical inactivity