Table 2.
Age at disease onset, disease duration and duration of follow up of cases and controls
| 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 | - | ||
a. overall P from ANOVA
b. Difference in mean when compared with group ACA (+) SS.
Data were calculated using both the first symptom and the first non Raynaud symptom as a starting point.