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Table 3 HDISS-DU score: known-group validity

From: Psychometric validation of the Hand Disability in Systemic Sclerosis-Digital Ulcers (HDISS-DU®) patient-reported outcome instrument

 GroupNumberMean HDISS-DU score (SE)f value/t valuep value
BaselineNumber of DUs
 ≤ 33372.94 (0.06)0.000.9854
 > 31782.94 (0.08)
DU complications category
 None5122.94 (0.05)4.960.0263
 Mild34.34 (0.63)
 Moderate0N/A
 Severe0N/A
Number of hands affected
 One1843.02 (0.08)1.320.2505
 Two3312.90 (0.06)
Week 8Number of DUs
 ≤ 32762.75 (0.06)2.390.1227
 > 31522.92 (0.09)
DU complications category
 None4072.76 (0.05)8.960.0002
 Mild203.75 (0.24)
 Moderate14.04 (1.05)
 Severe0N/A
Number of hands affected
 One1562.83 (0.09)0.140.7133
 Two2272.87 (0.07)
Week 16Number of DUs
 ≤ 32282.76 (0.07)6.710.0100
 > 31063.09 (0.10)
DU complications category
 None3062.83 (0.06)7.850.0005
 Mild162.64 (0.27)
 Moderate0N/A
 Severe124.05 (0.31)
Number of hands affected
 One1342.74 (0.09)6.100.0141
 Two1593.05 (0.08)
  1. Known-group validity was assessed by independent samples t test (2 patient groups; t value) or by ANOVA (≥ 3 patient groups; f value)
  2. ANOVA analysis of variance, DU digital ulcer, HDISS-DU Hand Disability in Systemic Sclerosis-Digital Ulcers, n number of participants, N/A not applicable, SE standard error