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Table 2 Age at disease onset, disease duration and duration of follow up of cases and controls

From: Anticentromere antibody positive Sjögren's Syndrome: a retrospective descriptive analysis

Disease Characteristics
  Age at first symptom (P= 0.108)α Age at first non-Raynaud symptom
(P= 0.279)α
  Mean SD Mean difference (P-value) b Mean SD Mean difference (P-value) b
ACA+/SS (n = 20) 52.35 15.0   53.55 15.2  
SSc/(+) sicca (n = 31) 43.29 15.8 0.187 47.23 13.2 0.699
SSc/(-) sicca (n = 20) 42.45 15.5 0.196 47.3 15.7 0.954
ACA-/SS (n = 61) 46.52 13.31 0.729 46.6 13.3 0.341
  Disease duration from onset of first symptom (P < 0.0001)α Disease duration from onset of first non-Raynaud symptom (P = 0.036)α
  Mean SD Mean difference (P-value) b Mean SD Mean difference (P-value) b
ACA+/SS (n = 20) 12.13 7.4   10.96 7.0  
SSc/(+) sicca (n = 31) 17.51 11.1 0.248 13.48 6.7 1.000
SSc/(-) sicca (n = 20) 15.99 11.7 1.000 11.20 8.6 1.000
ACA-/SS (n = 61) 8.89 7.4 1.000 8.78 7.3 1.000
  Duration of Follow up (P = 0.012)α -
  Mean SD Mean difference (P-value) b -
ACA+/SS (n = 20) 5.38 5.1   -
SSc/(+) sicca (n = 31) 7.87 5.2 0.494 -
SSc/(-) sicca (n = 20) 4.00 4.1 1.000 -
ACA-/SS (n = 61) 4.49 5.0 1.000 -
  1. a. overall P from ANOVA
  2. b. Difference in mean when compared with group ACA (+) SS.
  3. Data were calculated using both the first symptom and the first non Raynaud symptom as a starting point.