Variable

COR (95%CI)

AOR (95%CI)

p-value

Similar illness in the past 1 year

Yes

3.358 (2.291 - 4.988)

4.205 (2.795 - 6.439)

<0.001*

No

1

1

History of abortion/DNC/other invasive procedure

Yes

1.655 (1.046 - 2.683)

1.953 (1.184 - 3.295)

0.010*

No

1

1

Contraception use

yes

0.546 (0.332 - 0.897)

0.531 (0.308 - 0.887)

0.018*

no

1

1

Age at first sexual intercourse

Not yet

1

1

Less than 25 years

2.200 (1.220 - 4.007)

2.941 (1.552 - 5.661)

<0.001*

25 - 35 years

2.883 (1.754 - 4.762)

3.073 (1.791 - 5.320)

<0.001*

More than 35 years

2.880 (1.292 - 6.770)

2.307 (0.981 - 5.680)

0.060