Table 2.
Comparison of semen quality in infertile male patients of different occupational groups
| Parameter | Worker (n=34 094) | Peasant (n=788) | Intellectual (n=2529) | Businessman (n=1319) | Others (n=175) |
|---|---|---|---|---|---|
| Percentage of fast forward motile spermatozoa (%), median (IQR) | 35.90a (24.70, 46.20) | 38.60bc (28.57, 49.17) | 34.8d (24.00, 45.00) | 40.50be (29.70, 51.95) | 40.00ace (28.05, 49.00) |
| Percentage of total forward motile spermatozoa (%), median (IQR) | 51.20a (40.0, 62.70) | 54.65b (43.42, 65.33) | 49.40a (38.30, 61.00) | 56.40c (44.70, 68.45) | 54.80bc (41.95, 66.60) |
| Percentage of spermatozoa with normal morphology (%), median (IQR) | 3.5a (1.70, 6.10) | 4.00b (2.10, 7.00) | 3.50c (1.70, 6.00) | 5.4d (2.55, 8.90) | 5.40abc (2.30, 7.90) |
| Semen volume (ml), mean (s.d.) | 2.99a (1.6) | 3.0ab (1.43) | 3.0a (2.39) | 2.8bc (1.29) | 2.8ac (1.25) |
Significance level is 0.05. Among columns, figures with the same superscript are not significantly different, whereas those with different superscript are significantly different. The comparison of measurement data between groups used single-factor analysis of variance and the SNK test, while the variance was tested as homogeneity, otherwise Kruskal–Wallis multiple comparison was used. IQR: interquartile range; s.d.: standard deviation; SNK: Student–Newman–Keuls