Table 4 Results of meta-regression for the prevalence of metabolic syndrome

Univariate analyses

Sex ratio(male vs. female)

0.846

0.6195–1.155

0.283

1.83

Area(northern vs. southern)

1.0104

0.8486–1.2031

0.904

−3.14

Quality score

1.0044

0.9370–1.1641

0.421

−0.96

Year of screening

1.1046

0.9617–1.2687

0.153

3.62

Sample size, continuous

1.0000

0.9999–1.0001

0.519

−1.65

Age group(15 ~ =1, 40 ~ =2, 60 ~ =3)

1.2625

1.0615–1.5017

0.010

17.63

Year of publication

1.0988

0.8671–1.3924

0.424

−0.90

Multivariable analyses

26.74

Sex ratio(male vs. female)

−0.2331

−0.5318–0.6585

0.121

Area(northern vs. southern)

0.0095

−0.1543–0.1734

0.906

Quality score

0.0285

−0.0746–0.1315

0.576

Year of screening

0.0906

−0.9722–0.2785

0.331

Sample size, continuous

3.28e^’-7

−0.0000–0.0001

0.952

Age group(15 ~ =1, 40 ~ =2, 60 ~ =3)

0.3035

0.1187–0.4884

0.002

Year of publication

0.9168

−0.2391–0.4225

0.574