Table 2:
The studies of the prevalence of AD stratified by age group and gender by years
| Trends in the prevalence of AD by gender and age: 2007–2017 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Survey year | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
| Overall prevalence (%) | 4.4 | ||||||||
| Prevalence by year (%) | 3.44 | 3.82 | 5.53 | 4.63 | 5.42 | 4.92 | 5.26 | 8.42 | 2.85 |
| Gender (%) | |||||||||
| Male | 3.34 | 3.22 | 3.64 | 3.98 | 3.77 | 4.35 | 8.82 | 2.01 | |
| Female | 6.23 | 9.84 | 7.21 | 5.94 | 6.74 | 5.84 | 14.1 | 3.65 | |
| Age(yr) (%) | |||||||||
| 55–59 | / | / | / | 0.35 | / | / | / | / | / |
| 60–64 | / | / | 1.21 | 1.47 | 2.74 | / | / | 2.27 | / |
| 65–69 | 1.11 | 1.58 | 2.45 | 1.63 | 1.76 | / | 1.83 | 8.51 | / |
| 70–74 | 1.74 | 3.53 | 3.55 | 3.02 | 4.1 | / | 8.98 | 12.92 | / |
| 75–79 | 7.92 | 7.85 | 5.92 | 10.81 | 8.65 | / | 9.95 | 18.38 | / |
| ≥80 | 33.5 | 23.64 | 17.85 | 22.67 | 29.82 | / | / | 26.77 | / |
There were two different age-group ranges used in the studies: one included the age ranges of 55–64, 65–74, 75–84 and 85+ yr and was used by two studies, and the other included the age ranges of 50–59, 60–69, 70–79 and 80+ yr and was used in six studies. Nine studies did not provide information for the AD patients according to gender