Table 1Prevalence rate of rheumatoid arthritis according to age, sex and socio-economic characteristics
Variables |
Overall
|
Men
|
Women
|
n* |
Prevalence rate (%) |
SE |
n* |
Prevalence rate (%) |
SE |
n* |
Prevalence rate (%) |
SE |
Overall |
17,311 |
1.45 |
0.10 |
7,341 |
0.62 |
0.10 |
9,970 |
2.27 |
0.16 |
Age (yr) |
|
|
|
|
|
|
|
|
|
19-29 |
2,283 |
0.37 |
0.14 |
993 |
0.33 |
0.20 |
1,290 |
0.41 |
0.18 |
30-39 |
3,481 |
0.30 |
0.09 |
1,444 |
0.11 |
0.08 |
2,037 |
0.50 |
0.16 |
40-49 |
3,394 |
0.75 |
0.17 |
1,475 |
0.53 |
0.22 |
1,919 |
0.98 |
0.27 |
50-59 |
2,892 |
2.23 |
0.30 |
1,241 |
0.76 |
0.32 |
1,651 |
3.70 |
0.51 |
60-69 |
2,781 |
3.16 |
0.37 |
1,200 |
1.43 |
0.43 |
1,581 |
4.70 |
0.59 |
70+ |
2,480 |
5.28 |
0.51 |
988 |
2.14 |
0.56 |
1,492 |
7.17 |
0.75 |
Residence |
|
|
|
|
|
0. |
|
|
|
Urban (Dong) |
12,711 |
1.30 |
0.10 |
5,355 |
0.60 |
0.12 |
7,356 |
1.97 |
0.17 |
Rural (Eup or Myun) |
4,600 |
2.13 |
0.25 |
1,986 |
0.73 |
0.20 |
2,614 |
3.52 |
0.42 |
Education |
|
|
|
|
|
|
|
|
|
Elementary school or less |
5,034 |
4.36 |
0.33 |
1,498 |
1.90 |
0.45 |
3,536 |
5.55 |
0.41 |
Middle school |
1,926 |
2.34 |
0.39 |
910 |
1.53 |
0.54 |
1,016 |
3.17 |
0.59 |
High school |
5,914 |
0.64 |
0.11 |
2,686 |
0.44 |
0.14 |
3,228 |
0.86 |
0.16 |
Bachelor/Graduate |
4,373 |
0.25 |
0.07 |
2,213 |
0.07 |
0.05 |
2,160 |
0.49 |
0.16 |
Household income level |
|
|
|
|
|
|
|
|
|
1st quartile (very low) |
3,619 |
3.23 |
0.31 |
1,401 |
1.33 |
0.31 |
2,218 |
4.76 |
0.48 |
2nd quartile (low) |
4,216 |
1.29 |
0.19 |
1,784 |
0.58 |
0.21 |
2,432 |
1.96 |
0.29 |
3rd quartile (high) |
4,489 |
1.16 |
0.17 |
1,952 |
0.63 |
0.23 |
2,537 |
1.70 |
0.27 |
4th quartile (very high) |
4,549 |
0.86 |
0.12 |
2,027 |
0.34 |
0.13 |
2,522 |
1.42 |
0.23 |
Individual income level |
|
|
|
|
|
|
|
|
|
1st quartile (very low) |
4,225 |
1.50 |
0.17 |
1,809 |
0.52 |
0.15 |
2,416 |
2.47 |
0.32 |
2nd quartile (low) |
4,200 |
1.60 |
0.20 |
1,764 |
1.11 |
0.30 |
2,436 |
2.06 |
0.27 |
3rd quartile (high) |
4,225 |
1.37 |
0.20 |
1,791 |
0.44 |
0.20 |
2,434 |
2.29 |
0.32 |
4th quartile (very high) |
4,223 |
1.31 |
0.17 |
1,800 |
0.48 |
0.17 |
2,423 |
2.13 |
0.30 |
Occupation |
|
|
|
|
|
|
|
|
|
Manager/professional level |
1,883 |
0.40 |
0.14 |
1,049 |
0.21 |
0.12 |
834 |
0.73 |
0.32 |
Office workers |
1,212 |
0.32 |
0.17 |
666 |
0.20 |
0.20 |
546 |
0.51 |
0.30 |
Service workers/sellers |
2,121 |
0.68 |
0.20 |
849 |
0.30 |
0.27 |
1,272 |
1.04 |
0.28 |
Agriculture/fishery |
1,633 |
3.15 |
0.52 |
825 |
1.10 |
0.34 |
808 |
5.87 |
1.06 |
Technicians/mechanics/assemblers |
1,582 |
0.57 |
0.25 |
1,347 |
0.57 |
0.27 |
235 |
0.58 |
0.58 |
Simple labor |
1,483 |
1.47 |
0.29 |
596 |
0.53 |
0.26 |
887 |
2.31 |
0.51 |
Table 2Sex- and age-adjusted odds ratios of rheumatoid arthritis with socio-economic characteristics by logistic regression analysis
Variables |
OR |
95% CI
|
p-value |
Lower limit |
Upper limit |
Sex |
|
|
|
|
Men |
Reference |
|
|
|
Women |
3.15 |
2.24 |
4.45 |
<0.001 |
Age (yr) |
1.06 |
1.05 |
1.07 |
<0.001 |
Residence |
|
|
|
|
Urban (Dong) |
Reference |
|
|
|
Rural (Eup or Myun) |
1.10 |
0.83 |
1.46 |
0.52 |
Education |
|
|
|
|
Elementary school or less |
Reference |
|
|
|
Middle school |
0.96 |
0.64 |
1.44 |
0.85 |
High school |
0.41 |
0.26 |
0.64 |
<0.001 |
Bachelor/Graduate |
0.18 |
0.09 |
0.37 |
<0.001 |
Household income level |
|
|
|
|
1st quartile (very low) |
Reference |
|
|
|
2nd quartile (low) |
0.80 |
0.55 |
1.15 |
0.23 |
3rd quartile (high) |
0.96 |
0.67 |
1.36 |
0.80 |
4th quartile (very high) |
0.71 |
0.49 |
1.04 |
0.08 |
Individual income level |
|
|
|
|
1st quartile (very low) |
Reference |
|
|
|
2nd quartile (low) |
1.07 |
0.77 |
1.50 |
0.67 |
3rd quartile (high) |
0.93 |
0.65 |
1.34 |
0.70 |
4th quartile (very high) |
0.84 |
0.60 |
1.18 |
0.31 |
Occupation |
|
|
|
|
Manager/professional level |
Reference |
|
|
|
Office workers |
0.49 |
0.17 |
1.46 |
0.20 |
Service workers/sellers |
0.62 |
0.36 |
1.08 |
0.09 |
Agriculture/fishery |
1.28 |
0.89 |
1.85 |
0.18 |
Technicians/mechanics/assemblers |
0.82 |
0.34 |
2.01 |
0.67 |
Simple labor |
0.84 |
0.55 |
1.28 |
0.41 |
Table 3Employment rates of individuals with and without rheumatoid arthritis (RA) aged 45 to 64
|
Without RA
|
With RA
|
p-value |
n* = 5,774 N† = 12,061,610
|
n* = 133 N† = 236,265
|
Rate (%) |
SE |
Rate (%) |
SE |
Total |
68.1 |
0.9 |
41.7 |
5.0 |
< 0.001 |
Male |
83.4 |
0.9 |
63.2 |
12.4 |
0.04 |
Female |
52.3 |
1.2 |
35.3 |
4.8 |
0.001 |
Table 4Reasons for unemployment of unemployed female individuals with and without rheumatoid arthritis (RA) aged 45 to 64
|
Without RA |
With RA |
n* = 1,457 |
n* = 69 |
N† = 2,813,068 |
N† = 115,686 |
Rate (%) |
SE |
Rate (%) |
SE |
|
(100.0) |
|
(100.0) |
|
Don’t need to work |
25.4 |
1.7 |
16.3 |
5.0 |
At school |
0.5 |
0.2 |
- |
- |
Retired |
3.1 |
0.5 |
1.9 |
1.9 |
Health related problem (s) |
29.5 |
1.7 |
47.1 |
6.9 |
Laid off/still finding a job |
14.2 |
1.1 |
7.1 |
3.8 |
Child care/nursing someone |
19.3 |
1.3 |
15.8 |
5.2 |
Other |
8.0 |
1.0 |
11.8 |
5.5 |
Table 5Types of occupation and employment of employed female individuals with and without rheumatoid arthritis (RA) aged 45 to 64
|
Without RA
|
With RA
|
p-value |
Rate (%) |
SE |
Rate (%) |
SE |
Occupation type |
n*=1,746 N†=3,115,086 |
n*=44 N†=64,239 |
0.16 |
|
(100.0) |
|
(100.0) |
|
|
Manager/professional level |
8.7 |
0.9 |
2.9 |
2.8 |
|
Office workers |
5.4 |
0.7 |
5.8 |
4.0 |
|
Service workers/sellers |
34.9 |
1.5 |
31.4 |
8.2 |
|
Agriculture/fishery |
12.7 |
1.4 |
28.11 |
7.3 |
|
Technicians/mechanics/assembler |
8.6 |
0.9 |
4.4 |
4.2 |
|
Simple labor |
29.7 |
1.4 |
27.4 |
7.3 |
|
Employment type |
n*=1,746 N†=3,115,086 |
n*=44 N†=64,239 |
0.02 |
|
(100.0) |
|
(100.0) |
|
|
Wageworker |
55.6 |
1.7 |
39.2 |
8.1 |
|
Self-employed/employer |
30.0 |
1.5 |
31.1 |
7.2 |
|
Unpaid family worker |
14.4 |
1.1 |
29.7 |
7.7 |
|
Table 6Experience rates for sick in bed and sick leave of employed female individuals with and without rheumatoid arthritis (RA) aged 45 to 64
|
Without RA
|
With RA
|
p-value |
Rate (%) |
SE |
Rate (%) |
SE |
Sick in bed |
n* = 3,238 |
n* = 114 |
|
|
N† = 5,984,860 |
N† = 181,877 |
|
|
9.4 |
0.6 |
10.0 |
3.2 |
0.85 |
Sick leave |
n* = 1,747 |
n* = 44 |
|
|
N† = 3,113,938 |
N† = 64,239 |
|
|
6.7 |
0.8 |
9.7 |
5.0 |
0.50 |
Sick in bed due to RA |
|
|
3.9 |
2.1 |
|
Sick leave due to RA |
|
|
1.7 |
1.6 |
|