Max Rady College of Medicine

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1. OA
acronym for Osteoarthritis (OA)
2. Obesity and Risk for Obesity
Obesity can be simply defined as being very overweight. At MCHP, the risk for obesity has been measured using the Body Mass Index (BMI) and various scales that categorize the values of the BMI. These categories identify the risk for obesity. For mo...
3. Observation
One of 13 alternate levels of care (ALC) comprising short stay encounters for patients who require close nursing observation or medical management.
4. Observation Units
A designated area within or near an Emergency Department (ED) of an acute care hospital where patients are assessed to determine if they need to be admitted to hospital. Observation may include reassessment, diagnostic testing and short-term treatment. I...
5. Obstetric Service Type
See Pregnancy and Birth Service Type glossary term.
6. Obstetrical Trauma: Vaginal Delivery, with Instrumentation
Obstetric trauma during instrument-assisted vaginal delivery is an injury to the mother while giving birth by vaginal delivery with the aid of birthing instruments such as forceps or vacuums. Obstetric trauma includes fourth degree perineal lacerations; l...
7. Obstetrical Trauma: Vaginal Delivery, without Instrumentation
Obstetric trauma during vaginal delivery without instrumentation is an injury to the mother while giving birth by vaginal delivery without the aid of birthing instruments. Obstetric trauma includes fourth-degree perineal lacerations; laceration of the cer...
8. Obstetrician/Gynecologist
A specialist that deals with the female reproductive system and pregnancy.
9. Obstructive Sleep Apnea (OSA)
Obstructive sleep apnea (OSA) is a sleep disorder in which the upper airway repeatedly collapses and is obstructed. Symptoms include choking, snoring, periods of not breathing during sleep, and waking often. OSA is associated with excessive daytime sleepi...
10. Occasional Patients
Patients attending a health care provider who receive most of their care from another provider. They are considered core patients of the other provider.
11. Occupancy Rate
An indicator of hospital performance that measures the degree to which hospital beds are full. For each hospital, it is expressed as "Number of beds occupied"/"Number of Beds".
12. Odds
The ratio of the probability of an event to that of nonoccurrence. For example, if 60 males experienced a hip fracture and 40 did not, the odds of experiencing a hip fracture in males is 60:40 or 1.5.
13. Odds Ratio
The ratio of the odds (likelihood) of an event occurring in one group to the odds of it occurring in another group, or to a data-based estimate of that ratio (e.g.: from a logistic regression model). These groups might be men and women, an experimental gr...
14. Off-Reserve First Nations
Off-Reserve First Nations includes Registered (Indian Act Status) First Nations who live outside of the First Nation community with which they are affiliated in the First Nations Research File in 2016. For more information about the Manitoba First Nations...
15. Office of the Public Trustee
See Public Trustee Office glossary term.
16. Offset Variable
An offset variable is used to adjust Poisson and Negative Binomial models for differential "exposure" in data records (e.g., different lengths of time periods, populations).
17. Older Adults
People age 65 years and older. This age group can be further grouped in young-old (65-74), middle-old (75-84) and old-old (85+) age categories.
18. Oligohydramnios Diagnosis
A pregnancy condition characterized by a low level of amniotic fluid. (Shannon DW, 2011). For more information, please read the CVS Pharmacy Health Information Center web page on
19. OLS Regression
acronym for Ordinary Least Squares (OLS) Regression
20. On-Reserve First Nations
On-Reserve First Nations includes Registered (Indian Act Status) First Nations who live within the First Nation community with which they are affiliated in the First Nations Research File in 2016. For more information about the Manitoba First Nations Rese...

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Rady Faculty of Health Sciences,
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