Table 1 Demographic characteristics of subjects
Characteristic |  | No. | Mean(± SD) or % |
|---|---|---|---|
Age (y) |  | 251 | 28.9 ± 5.5 |
Duration of infertility (y) |  | 251 | 6.9 ± 4.5 |
No. of previous treatment |  | 251 | 1.3 ± 1.4 |
Education | No education | 6 | 2.4 |
| Â | Primary school | 36 | 14.3 |
| Â | Junior school | 60 | 23.9 |
| Â | High school | 12 | 4.8 |
| Â | Intermediate education | 88 | 35.1 |
| Â | University | 49 | 19.5 |
Type of infertility | Primary | 230 | 91.6 |
| Â | Secondary | 21 | 8.4 |
Cause of infertility | Male | 86 | 34.3 |
| Â | Female | 108 | 43 |
| Â | Combined | 32 | 12.7 |
| Â | Unexplained | 25 | 10 |
Result of β-hCG | Positive | 61 | 24.3 |
| Â | Negative | 190 | 75.7 |