VALIDATION DATA

MEASUREMENT PROPERTIES
Limitations >=5 European languages (English)
Observations
1. RELIABILITY
A. Internal Consistency Not Tested
Cronbach's (Describe)
B. Reliability intraobserver or test-retest Not Tested
Continuous scores: intraclass
correlation coefficient (ICC)
Dichotomus: Cohen kappa (Describe)
C. Reliability interobserver or Measurement error Not Tested
Standard error of measurement (SEM),
smallest detectable change (SDC) or
Limits of agreement (LoA) (Describe)
2. VALIDITY
A. Content validity: face validity Not Tested
Expert opinion (relevance and
comprehensiveness) (Describe)
B. Construct Validity:
Structural validity		 Tested
Hypotheses-testing Tested
Cross-cultural validity Not Tested
Brief Description

Of the 257 patients who answered the question as to whether they needed to consult their rheumatologist, 80 (31.1%) reported a need to consult their rheumatologist. Only 23.9% of PASS positive patients reported a need for consultation as compared with 63.7% of PASS negative patients (P < 0.001). Of the 271 patients who answered the question regarding flare status, 133 (49.1%) reported being in a current flare. Only 29.6% of PASS positive patients reported being in a current flare as compared with 76.8% of PASS negative patients (P < 0.001). Consequently, PASS status reflected both patients' need to consult their rheumatologist and the presence of current disease flare (71% and 73% correctly classified, respectively).
Only 36 (12%) of all patients met the ASAS criteria for remission. Of the 165 patients who reported being in PASS condition, 34 (20.6%) also met the ASAS criteria for remission as compared with only 2 (1.8%) of 114 patients that were PASS negative (P < 0.001). After adjusting for age and sex, PASS was significantly contributory to QOL (ASQoL; B = −5.99; 95% CI −7.16, −4.08)
C. Criterion validity Not Tested
Comparison with a 'gold standard' Continuous scores:
correlations, ROC curves Dichotomus:
Sensitivity & Specificity (Describe)