Table 5 Logistic regression model

Age (years)

 21–30 yrs.

−0.832

0.285

0.435

0.095

2.003

 31–40 yrs.

Reference

Semen culture

 Negative

−0.437

0.339

0.646

0.263

1.583

 Positive

Reference

Type of infertility

 Primary

−1.310

0.012

0.270

0.097

0.750

 Secondary

Reference

Specific cause

 Combined

0.768

0.339

2.155

0.446

10.401

 Male

−1.043

0.154

0.352

0.084

1.478

 Ovarian

0.249

0.803

1.283

0.181

9.090

 Tubal

−1.442

0.045

0.237

0.058

0.969

 Unexplained

−0.686

0.371

0.504

0.112

2.263

 Uterine

Reference

Sperm count

 Normospermia

0.152

0.775

1.164

0.412

3.289

 Oligospermia

Reference

Fertilization rate

 Good

−0.821

0.190

0.440

0.129

1.503

 Poor

Reference

Number of embryo transferred

 1–2

−0.204

0.718

0.815

0.269

2.472

 3 and above

Reference

 Constant

2.308

0.015

10.057