Prevalence and Risk Factors of Gastrointestinal Disorders in Patients with Rheumatoid Arthritis: Results from a Population-Based Survey in Olmsted County, Minnesota

Table 2

Demographics and RA characteristics in survey responders and nonresponders to the survey among patients with rheumatoid arthritis.

Variable	Responders to the survey (𝑁=284)	Nonresponders to the survey (𝑁=209)	𝑃 value*
Mean age on the date of response, years (SD)	62.4 (13.4)	61.0 (15.4)	0.16
Female, 𝑛 (%)	204 (72)	155 (74)	0.57
Mean duration of RA, years (SD)	10.3 (7.2)	9.8 (6.9)	0.55
RF positive, 𝑛 (%)	188 (67)	141 (68)	0.79

* 𝑃 value indicates the differences between survey responders and nonresponders to the survey.
Abbreviations: RA: rheumatoid arthritis; SD: standard deviation; RF: rheumatoid factor.