Table 1: Demographic and clinical characteristics of patients with incident and prevalent ankylosing spondylitis.

IncidentPrevalent
Percentage (STD) 2.383Percentage (STD) value

Age (continuous)38.7411.5540.5211.350.0007
 Age 18–3935258.37%122151.24%0.0017
 Age 40–6423739.30%110046.16%0.0025
 Age 65+142.32%622.60%NS
Female26744.28%90537.98%0.0046
Region
 Eastern Anatolia region101.66%441.85%NS
 Southeastern Anatolia region142.32%321.34%0.0812
 Marmara region29749.25%109445.91%NS
 Aegean region7712.77%40016.79%0.0162
 Mediterranean region416.80%1827.64%NS
 Black Sea region345.64%1104.62%NS
 Central Anatolia region13021.56%52121.86%NS
Comorbidities
 Elixhauser index score 2.243.896.045.01<0.0001
 Cardiovascular6711.11%39016.37%0.0014
 Diabetics365.97%1928.06%0.0847
 Respiratory14423.88%89637.60%<0.0001
 Allergy467.63%1486.21%NS
Medications
 TNF457.46%82834.75%<0.0001
 NSAIDs60371.64%238377.01%0.0055
 DMARDs12921.39%55523.29%NS

STD: standard deviation; NS: not significant; TNF: tumor necrosis factor; NSAIDs: nonsteroidal anti-inflammatory drugs; DMARDs: disease-modifying antirheumatic drugs.