Among the 765 participants, 1737 falls occurred over the 4.3 years of follow-up, of which 173 (10%) were classified as seriously injurious. The average annual rate of falls per person was 0.83 (95% confidence interval [CI] = 0.76, 0.92). About 36.6% percent of participants had no falls over the 4.3 years, 35.3% averaged less than 1 fall per year, 15.7% averaged 1 to 1.9 falls per year, and 12.4% averaged 2 or more falls per year. Of the 1737 falls, 929 were indoors and 808 outdoors. Among all falls, 40.1% occurred while walking (35.5% of indoor falls and 45.4% of outdoor falls. A confidence interval for the average annual rate of falls per person is given. What type of confidence interval is this? In other words, is this a confidence interval for a proportion, a mean, an odds ratio, etc.?
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
Among the 765 participants, 1737 falls
occurred over the 4.3 years of follow-up, of
which 173 (10%) were classified as seriously
injurious. The average annual rate of falls
per person was 0.83 (95% confidence interval
[CI] = 0.76, 0.92). About 36.6% percent of
participants had no falls over the 4.3 years,
35.3% averaged less than 1 fall per year,
15.7% averaged 1 to 1.9 falls per year, and
12.4% averaged 2 or more falls per year.
Of the 1737 falls, 929 were indoors and
808 outdoors. Among all falls, 40.1% occurred
while walking (35.5% of indoor falls and
45.4% of outdoor falls.
- A confidence interval for the average annual rate of falls per person is given. What type of confidence interval is this? In other words, is this a confidence interval for a proportion, a mean, an odds ratio, etc.?
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