Infants, children and young adults:

• Overall, the rate of stays for infants, children 1-17, and adults 18-44 remained relatively stable from 1997 to 2009.
• Pregnancy, childbirth, and liveborn infants:
• In 2009, most stays for children under one year old were for liveborn (newborn infants).
• Among 18-44 year olds, previous C-sections increased 93 percent between 1997 and 2009, while normal pregnancy and/or delivery fell 51 percent.
• The rate of asthma stays declined 24 percent among children 1-17 years between 1997 and 2009, while the rate of stays for appendicitis increased 19 percent.
• Mood disorders was the third most common diagnosis for children 1-17 and adults 18-44 years.

Older adults:

• Musculoskeletal conditions:
• Osteoarthritis was the most common condition for adults 45-64 with an increase of 151 percent in the rate of stays per 10,000 population.
• Between 1997 and 2009, osteoarthritis increased by 58 percent among adults aged 65-84 and was the second most common condition.
• Spondylosis, intervertebral disc disorders, and other back problems—the fourth most common condition among 45-64 year olds—remained relatively stable from 1997 to 2009.
• Cardiovascular conditions were common diagnoses for adults 45 years and older. However, specific diagnoses differed between age groups for older adults:
• Coronary atherosclerosis was the second most common condition for adults 45-64; the rate of these stays declined by 53 percent between 1997 and 2009. This condition ranked fifth for 65-84 year olds, with the rate of stays declining 51 percent between 1997 and 2009.
• Congestive heart failure (CHF) was the most common condition for adults 65-84 and 85 and older. In 2009, CHF accounted for 149 hospital stays per 10,000 population among all adults in the U.S. aged 65-84 and 433 stays per 10,000 population among all adults 85 and older.
• Congestive heart failure decreased per 10,000 population for both 65-84 year olds and those 85 and older, by 22 and 16 percent, respectively.
• Cardiac dysrhythmias was the reason for 224 hospitalizations per 10,000 population in 2009 among adults age 85 years and older, an increase of 25 percent since 1997.
• Among adults 85 and older, hospitalizations for septicemia (up 35 percent) and urinary tract infections (up 27 percent) increased at more than twice the rate of all hospitalizations for this age group between 1997 and 2009.

All patients:

• Pneumonia was a top five condition for all groups except 18-44 year olds and declined for most ages:
• Hospital stays for pneumonia declined for infants (down 48 percent).
• In 2009, stays for pneumonia remained relatively stable among children 1-17 years and adults 45-64 years old.
• Stays for pneumonia fell among 65-84 year olds (down 25 percent) and for adults aged 85 and older (36 percent).

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