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 |
| Primary school | 36 | 14.3 | |
| Junior school | 60 | 23.9 | |
| High school | 12 | 4.8 | |
| Intermediate education | 88 | 35.1 | |
| University | 49 | 19.5 | |
| Type of infertility | Primary | 230 | 91.6 |
| Secondary | 21 | 8.4 | |
| Cause of infertility | Male | 86 | 34.3 |
| Female | 108 | 43 | |
| Combined | 32 | 12.7 | |
| Unexplained | 25 | 10 | |
| Result of β-hCG | Positive | 61 | 24.3 |
| Negative | 190 | 75.7 |