Table 1

Selected patient characteristics by year

YearPatient countSemiannual measurement (n)% Men% African–AmericansAge in years (mean (SD))Disease duration in years (mean (SD))% Current smokersBody mass index (mean (SD))Disability (mean (SD))
19831307232323.71.557.2 (13.0)14.4 (10.5)25 (4.6)1.26 (0.83)
19841254227723.31.356.9 (13.1)15.2 (10.6)25 (4.6)1.26 (0.82)
19851248234522.91.557.2 (13.2)15.8 (10.5)25 (4.6)1.32 (0.86)
19861387247522.11.357.8 (13.3)16.2 (10.5)25 (4.8)1.31 (0.83)
19871395250522.21.158.2 (13.3)16.5 (10.7)19.225 (5.0)1.31 (0.83)
19881504274721.91.259.1 (13.2)17.1 (10.9)15.725 (5.0)1.32 (0.83)
19891689312222.51.459.9 (13.1)17.5 (11.0)16.025 (5.1)1.34 (0.84)
19901779306321.82.860.7 (13.1)17.9 (11.0)16.625 (5.0)1.33 (0.85)
19911693309121.42.460.8 (12.9)18.4 (11.0)22.226 (5.1)1.30 (0.84)
19921672307921.52.061.2 (12.8)18.6 (11.1)27.926 (5.1)1.30 (0.82)
19931578297320.32.461.8 (12.8)19.0 (11.2)27.426 (5.1)1.30 (0.82)
19941687300520.52.262.2 (12.8)19.3 (11.3)25.226 (5.2)1.29 (0.81)
19951542287420.91.662.6 (12.7)19.4 (11.2)25.526 (5.3)1.27 (0.81)
19961534278820.72.062.4 (12.9)19.8 (11.5)24.226 (5.5)1.25 (0.8)
19971864325221.32.461.7 (13.3)19.4 (11.8)22.226 (5.4)1.21 (0.79)
19982241391220.92.461.5 (13.5)19.0 (11.7)19.326 (5.5)1.16 (0.78)
19991945358520.92.561.4 (13.5)19.2 (11.8)18.027 (5.7)1.15 (0.78)
20001571268819.62.161.9 (13.3)20.4 (12.2)10.827 (5.7)1.14 (0.78)
20011506227220.02.562.2 (13.0)20.8 (11.8)10.627 (6.0)1.12 (0.77)
20021064190219.53.262.8 (12.7)22.0 (12.3)7.227 (6.0)1.11 (0.77)
20031201223620.94.162.6 (12.8)21.7 (12.6)7.627 (5.9)1.08 (0.78)
20041102204621.04.763.1 (12.5)22.7 (12.6)7.827 (5.8)1.07 (0.78)
20051035191120.34.263.8 (12.3)23.2 (12.3)6.326 (5.6)1.08 (0.79)
2006920152420.03.764.3 (12.2)24.1 (12.1)5.027 (5.8)1.05 (0.78)