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. Author manuscript; available in PMC: 2015 Jun 15.
Published in final edited form as: Arthritis Care Res (Hoboken). 2013 Jul;65(7):1059–1069. doi: 10.1002/acr.21977

Table 2.

Unadjusted and adjusted associations (prevalence ratios (PR) and 95% confidence intervals (CIs)) of International Classification of Functioning, Disability, and Health (ICF) characteristics, by domain, with Social Participation Restriction (SPR) among U.S. adults ≥18 years with self-reported doctor-diagnosed arthritis, National Health Interview Survey, 2009.

Unadjusted
associations
with SPR
PR (95% CI)
Multivariate
ICF domain-
specific models
PR (95% CI)
Meta Multivariate
model (includes
all ICF domains)*
PR (95% CI)
Impairments
Severe joint pain (≥7/10) (ref = no) 3.4 (2.9-4.0) 1.7 (1.4-2.0) 1.4 (1.2-1.6)
Body Mass Index (BMI)
 Underweight/normal (<25.0) 1.0 - -
 Overweight (25.0-29.9) 0.8 (0.6-1.0) - -
 Obese (≥30.0) 1.0 (0.8-1.2) - -
Number of selected comorbid conditions
 0 1.0 1.0 -
 1 to 2 2.0 (1.6-2.7) 1.4 (1.1-1.7) -
 ≥3 4.2 (3.2-5.6) 1.5 (1.2-1.9) -
Serious Psychological Distress (ref = no) 4.5 (3.7-5.4) 2.5 (2.0-3.2) -
Sleep in 24 hour period (hours)
 1-5 2.3 (1.9-2.9) 1.3 (1.0-1.6) 1.3 (1.1-1.6)
 6-8 1.0 1.0 1.0
 ≥9 2.6 (2.1-3.2) 1.5 (1.3-1.9) 1.6 (1.3-2.0)
Limitations (defined as “very difficult” or “cannot do”) (ref = not limited)
Carry or lift something as heavy as 10 pounds 10.8 (9.2-12.7) - -
Climb up 10 step without resting 10.0 (8.5-11.8) - -
Grasp or handle small objects with your fingers 5.2 (4.4-6.1) - -
Push or pull large objects (e.g., living room chair) 10.2 (8.5-12.2) - -
Reach up over your head 5.8 (4.9-6.8) - -
Sit for about 2 hours 4.5 (3.9-5.3) - -
Stand for about 2 hours 14.0 (11.1-17.7) - -
Stoop, bend, or kneel 8.9 (7.3-10.8) - -
Walk 1/4 mile or 3 city blocks 13.7 (11.1-17.0) - -
Summary limitation variables
≥1 limitation (ref = no) 41.9 (25.5-68.8) - -
≥3 limitations (ref = no) 19.3 (15.0-24.9) - -
Key limitation (walk/stand/carry) (ref = no) 31.2 (22.3-43.5) 31.2 (22.3-43.5) 24.3 (16.8-35.1)
Environmental Factors
Homeownership
 Own/being bought 1.0 - -
 Rent/other 1.8 (1.5-2.1) - -
Household size (# of people in household)
 Single 1.0 - -
 2 0.7 (0.6-0.8) - -
 ≥ 3 0.7 (0.6-0.9) - -
Marital Status
 Married/living with partner 1.0 1.0 1.0
 Divorced/separated/widowed 2.0 (1.7-2.4) 1.4 (1.2-1.7) 1.1 (0.9-1.3)
 Never married 1.6 (1.2-2.0) 1.2 (0.9-1.5) 1.3 (1.0-1.6)
Medical office visits in past year
 0-1 visits 1.0 1.0 -
 2-4 visits 1.5 (1.1-2.0) 1.6 (1.2-2.2) -
 ≥5 visits 3.3 (2.4-4.5) 3.4 (2.5-4.4) -
Health insurance status
 Have health insurance 1.0 (0.7-1.3) - -
 No health insurance 1.0 - -
Delayed healthcare due to cost (ref = no) 1.5 (1.3-1.9) - -
Received government assistance last calendar year
(ref = no)
3.0 (2.5-3.6) - -
Income-to-poverty ratio (10.6% missing)
 (Below or near poverty) < 2.00 2.9 (2.5-3.4) 2.5 (2.1-3.0) 1.4 (1.2-1.6)
 ≥2.00 1.0 1.0 1.0
Most educated household adult
 Less than high school 1.7 (1.4-2.1) - -
 GED or high school graduate 1.0 - -
 Some college, no degree 0.8 (0.7-1.0) - -
 College degree or more 0.6 (0.5-0.7) - -
Personal Factors
Age (years)
 18-44 1.0 1.0) -
 45-64 1.1 (0.8-1.4) 1.0 (0.8-1.3) -
 65+ 1.5 (1.2-2.0) 1.2 (1.0-1.6) -
Sex
 Male 1.0 1.0 1.0
 Female 1.4 (1.2-1.7) 1.3 (1.1-1.6) 1.1 (1.0-1.3)
Race/Ethnicity
 Non-Hispanic White 1.0 1.0 1.0
 Non-Hispanic Black 1.5 (1.2-1.8) 1.2 (1.0-1.5) 0.9 (0.7-1.1)
 Hispanic 1.3 (1.0-1.7) 1.0 (0.7-1.3) 1.1 (0.9-1.4)
 Non-Hispanic Other 1.7 (1.2-2.4) 1.7 (1.2-2.4) 1.4 (1.0-1.9)
Education
 Less than high school 2.1 (1.7-2.5) 1.8 (1.5-2.1) -
 GED or high school graduate 1.0 1.0 -
 Some college, no degree 0.8 (0.6-1.1) 1.0 (0.8-1.3) -
 College degree or more 0.6 (0.5-0.8) 0.9 (0.7-1.1) -
Employment status
 Working 1.0 - -
 Not working 1.0 (0.9-1.2) - -
Current smoker (ref = no) 1.4 (1.2-1.7) 1.3 (1.1-1.6) 1.2 (1.0-1.4)
Physical activity level-aerobic
 Recommended 1.0 1.0 -
 Insufficient 2.3 (1.6-3.3) 2.0 (1.5-2.9) -
 Inactive 6.1 (4.6-8.1) 4.8 (3.6-6.4) -
≥24 hours homeless or in jail (ref = no) 1.9 (1.5-2.4) - -
Retrieve health information from the internet
(ref = no)
0.4 (0.3-0.5) - -
*

NOTE: The Multivariate ICF domain-specific models column presents associations for each domain examined independently. The Meta Multivariate model column presents associations for all ICF domains examined simultaneously in the same model.