TABLE 16. Estimates of adults aged ≥18 years with arthritis and age-standardized* percentages of arthritis health-related characteristics among adults with arthritis,† by quartile§ of state-level prevalence of arthritis — Behavioral Risk Factor Surveillance System, United States, 2015.
| Estimate/Characteristic | Q1 (17.2%–21.5%) % (95% CI) | Q2 (21.5%–22.7%) % (95% CI) | Q3 (23.0%–25.4%) % (95% CI) | Q4 (25.7%–33.6%) % (95% CI) | p-trend¶ |
|---|---|---|---|---|---|
| No. of respondents with arthritis |
36,278 |
43,596 |
29,347 |
36,929 |
— |
| Weighted population with arthritis |
21,702,000 |
12,741,000 |
10,866,000 |
15,694,000 |
— |
| Arthritis-attributable activity limitations |
48.7 (46.7–50.6) |
47.8 (46.1–49.5) |
49.1 (47.1–51.2) |
52.9 (51.3–54.4) |
<0.001 |
| Arthritis-attributable severe joint pain |
31.3 (29.5–33.2) |
26.6 (25.2–28.1) |
29.5 (27.7–31.5) |
35.4 (33.9–36.8) |
<0.001 |
| Arthritis-attributable social participation restriction |
20.1 (18.5–21.8) |
17.4 (16.2–18.6) |
20.5 (18.9–22.1) |
23.7 (22.5–25.1) |
<0.001 |
|
≥14 physically unhealthy days during past 30 days |
27.3 (25.6–29.0) |
26.2 (24.7–27.7) |
27.0 (25.3–28.8) |
30.2 (28.9–31.5) |
<0.006 |
|
≥14 mentally unhealthy days during past 30 days |
22.6 (21.0–24.3) |
22.1 (20.7–23.5) |
24.0 (22.2–25.9) |
25.7 (24.4–27.1) |
0.001 |
| Obesity |
37.4 (35.6–39.3) |
39.5 (37.8–41.2) |
40.3 (38.4–42.4) |
45.0 (43.6–46.5) |
<0.001 |
| Leisure-time physical inactivity |
33.8 (32.0–35.8) |
31.4 (29.8–33.0) |
35.0 (33.0–37.0) |
38.4 (37.0–39.9) |
<0.001 |
| Leisure-time walking | 48.2 (46.3–50.1) | 49.5 (47.8–51.2) | 48.0 (46.0–50.1) | 45.1 (43.6–46.6) | 0.001 |
Abbreviations: CI = confidence interval; Q = quartile.
* Age standardized to the 2000 U.S. projected population, using three age groups: 18–44, 45–64, and ≥65 years.
† Doctor-diagnosed arthritis was defined as a yes response to the question “Has a doctor, nurse, or other health professional ever told you that you have some form of arthritis, rheumatoid arthritis, gout, lupus, or fibromyalgia?”
§ Quartiles (Q1–Q4) were calculated from age-standardized prevalences of arthritis for the 50 states and the District of Columbia. Q1 (lowest): Hawaii, California, Minnesota, Texas, the District of Columbia, Nevada, New Jersey, Utah, Alaska, Nebraska, Maryland, New York, Florida, and Illinois. Q2: Virginia, North Dakota, Connecticut, Colorado, South Dakota, Arizona, Massachusetts, Wisconsin, New Mexico, Washington, and Kansas. Q3: New Hampshire, Iowa, Idaho, Vermont, Georgia, Montana, Wyoming, Rhode Island, Oregon, Delaware, North Carolina, Ohio, and Indiana. Q4 (highest): Pennsylvania, Oklahoma, Louisiana, South Carolina, Maine, Mississippi, Missouri, Michigan, Arkansas, Kentucky, Tennessee, Alabama, and West Virginia.
¶ p-value for test of linear trend in age-standardized prevalence estimates across quartiles. Bonferroni-corrected alpha level of 0.006 (α = 0.05/8) to adjust for testing multiple characteristics. Quadratic terms were applied to the test of trend to improve fit and were statistically significant at the alpha level of 0.006 for three characteristics (arthritis-attributable severe joint pain, arthritis-attributable social participation restriction, and leisure-time physical inactivity).