Table 2. Prevalence of risk factors for developing sacral fatigue fractures.
| Risk factor | Sacral fatigue fracture |
| Deficient diet | 100% (7/7) |
| Recent increase in training intensity | 100% (7/7) |
| Hx of amenorrhea/oligomenorrhea | 100% (2/2) |
| Low body mass index (BMI) indicating underweight/underweight | 100% (1/1) |
| High BMI indicating overweight/overweight | 100% (1/1) |
| High BMI indicating obesity/obese | 100% (1/1) |
| Large weight gain during pregnancy | 100% (1/1) |
| Eating disorder | 100% (1/1) |
| Female child | 100% (1/1) |
| Long distance runner | 80% (4/5) |
| Hx of stress fractures | 75% (3/4) |
| Postpartum | 66.7% (2/3) |
| Recent increase in activity | 50% (1/2) |
| Low bone mineral density (BMD) | 42.9% (3/7) |
| Amenorrhea | 33.3% (2/6) |
| Elderly female | 0% (0/12) |
| Smoker | 0% (0/1) |
| Prolonged immobilization | 0% (0/1) |
| Corticosteroid therapy | 0% (0/1) |
| Vitamin D deficiency | 0% (0/1) |
| Low serum calcium level | 0% (0/1) |
| Low serum phosphorus level | 0% (0/1) |
| High alkaline phosphatase level | 0% (0/1) |
| Hypothyroidism | 0% (0/1) |
Not all studies evaluated each risk factor; thus, the total values in parentheses represent the numerator (risk factor present) over the denominator (risk factor evaluated) within the total number of studies included in the investigation.