Data underlying the analyses.

Background
Therapeutic communication is a core component of person-centered nursing care. Despite its clinical relevance, few validated instruments exist in Spanish that objectively assess this competence in undergraduate nursing students.
Objective
This study aimed to adapt and validate the Spanish version of the Therapeutic Communication Scale in Nursing Students (TCS-NS), originally developed by Han et al. (2024), and to examine its psychometric properties in a Spanish-speaking context.
Methods
A psychometric study was conducted in two phases: (1) translation and cross-cultural adaptation following international guidelines, including expert panel review and pilot testing; and (2) psychometric evaluation with a sample of 468 nursing students. Construct validity was assessed using confirmatory factor analysis (CFA), and reliability was examined via Cronbach’s alpha, McDonald’s omega, composite reliability, and test-retest stability (ICC).
Results
The CFA supported the two-factor structure of the TCS-NS and indicated good model fit (CFI = .963; TLI = .954; RMSEA = .053; SRMR = .044). Internal consistency was adequate for the total scale (α = .880; ω = .884), and composite reliability was high (.936). The intraclass correlation coefficient for the total score was.696 (95% CI:.605–.766).
Conclusions
The Spanish version of the TCS-NS is a valid and reliable instrument for assessing therapeutic communication skills in nursing students. Its use may contribute to the objective evaluation of communication competence in educational interventions and research.