Primaparous females had fewer young per litter than multiparous females. Multiparous women may be excluded from becoming donors due to heightened TRALI risk. Hegar's sign is more difficult to recognize in multiparous women. The same increase in length was found in multiparous women as opposed to primiparous. Physiological absent response can be due to obesity, tolerance, children, multiparous lax abdominal wall.