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Incidence of primary uterine inertia distributed by age group (n = 42)
| Age of bitch (years) | Whelpings with uterine inertia (no.) | Frequency distribution among all the whelpings (%) | Frequency distribution among the dystocias (%) |
| 2 | 4 | 7.7 | 50.0 |
| 3 | 8 | 11.1 | 57.1 |
| 4 | 13 | 26.0 | 76.5 |
| 5 | 9 | 23.1 | 69.2 |
| 6 | 6 | 22.0 | 46.2 |
| 7 | 2 | 20.0 | 40.0 |
