Table 2 Logistic regression model for rheumatoid arthritis

Years of Education

− 0.050

0.022

0.0250

0.951

0.910

0.994

Pregnancy Number

− 0.190

0.204

0.352

0.827

0.554

1.234

Alive Childbirth Number

0.242

0.206

0.241

1.273

0.850

1.908

First Pregnancy Age

− 0.026

0.015

0.072

0.974

0.947

1.002

Abortion Number

0.238

0.215

0.269

1.268

0.832

1.934

Breast feeding Duration

0.000

0.001

0.964

1.000

0.997

1.003

Waist Circumference

0.016

0.010

0.125

1.016

0.996

1.036

BMI

− 0.008

0.024

0.753

0.993

0.947

1.040

Smoke Cigarette

0.115

0.218

0.597

1.122

0.732

1.719

Has Stillbirth

− 0.258

0.298

0.387

0.773

0.431

1.386

Constant

-3.213

0.711

0.000

0.040