Among the 765 participants, 1737 falls occurred over the 4.3 years of follow-up, of which XXXXXXXXXX%) were classified as seriously injurious. The average annual rate of falls per person was...

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.

1. 
   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.?