this study caught my attention
CIHI releases top 10 reasons for hospitalization and surgery
http://www.cihi.ca/cihi-ext-portal/inter...indicators/international/release_05mar15
and the winners are:
1. Giving birth
2. Chronic obstructive pulmonary disease (COPD)
3. Heart attack
4. Congestive heart failure
5. Osteoarthritis of the knee
6. Pneumonia
7. Other medical causes (e.g., palliative care, chemotherapy)
8. Mood disorders
9. Schizophrenia and other delusional disorders
10. Fracture of the femur