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Table 5 Association between daily sun exposure time (minutes) and parameters of disease activity or disability (percent of patients or mean ± SD)

From: Vitamin D deficiency in rheumatoid arthritis: prevalence, determinants and associations with disease activity and disability

Sun exposure time (minutes) <10 10 to 20 20 to 30 >30 P= Chi-square or ANOVA
Disease Remission = No 85.8% 70.3% 76.3% 73.7% 0.007
Treatment Response = Fair or No 61.1% 54.6% 50.6% 52.9% 0.05
Steinbrocker Functional state > 1 69.6% 66.5% 59.0% 57.4% 0.001
Swollen joints count 4.3 ± 6.3 3.2 ± 4.9 2.4 ± 4.0 2.1 ± 3.3 <0.001
DAS28 >3.1 83.1% 73.7% 70.9% 65.5% <0.001
HAQ score 1.4 ± 0.9 1.2 ± 0.9 1.0 ± 0.8 0.9 ± 0.7 <0.001
  1. Abbreviations: DAS 28, Disease Activity Score 28; HAQ, Health Assessment Questionnaire Disability Index.