Advanced age and male gender were significantly associated with the diagnosis of sleep-related breathing disorders; abbrv.: RA: rheumatoid arthritis, PsA: psoriatic arthritis, SD: standard deviation, BMI: body mass index, COPD: chronic obstructive pulmonary disease, CRP: C-reactive protein, DAS28CRP: Disease Activity Score in 28 joints using CRP, N/A: not applicable; *p < .05 was considered significant. The gene discussed is CRP; the disease is psoriatic arthritis.