Evaluation of validity, reliability and ability to detect change for the Hand Eczema Severity Index (HECSI) and evaluation of HECSI-75 and HECSI-90 as within-patient responder definitions.

Background: The Hand Eczema Severity Index (HECSI) is a Clinician-Reported Outcome measure of the severity of hand eczema (HE).

Objectives: This study aimed to evaluate the validity, reliability and ability to detect change of the HECSI, and the HECSI-75 and HECSI-90 as responder definitions.

Methods: Analyses were performed using data from a sample of n = 258 patients with Chronic Hand Eczema (CHE) from a Phase 2b, randomised, double-blind, vehicle-controlled trial of delgocitinib cream, pooled across treatment groups. The measurement properties of the HECSI were assessed and the adequacy of the HECSI-75 and HECSI-90 as responder definitions was explored through cross-tabulation.

Results: Inter-item correlations provided support for the scoring, whereby items are grouped by areas of the hand. HECSI demonstrated good test-retest reliability with intra-class correlations >0.70. Construct validity was supported by a logical pattern of correlations with concurrent measures and significant differences in HECSI scores across severity groups (p < 0.001). HECSI was responsive with statistically significant improvements over time and with significant differences (p < 0.001) between improved and stable groups. Data provided support for both HECSI-75 and HECSI-90 as within-patient responder definitions.

Conclusions: HECSI has strong validity, reliability and ability to detect change as a measure of CHE severity. HECSI-75 and HECSI-90 are appropriate responder definitions.