Prospective Associations of Behavioural and Organisational Factors with Initial Nursing Diagnosis Use: A Longitudinal Study.

Background/Objectives: Nursing diagnoses (NDs) support clinical reasoning, individualised care planning, and the visibility of nursing practice, yet their implementation remains inconsistent. This study prospectively examined whether TPB-informed beliefs, attitudes towards NDs, behavioural intention, and the nursing practice environment were associated with initial ND use and subsequent documentation intensity. Methods: A prospective observational cohort study was conducted across 14 adult inpatient units within a public healthcare organisation in Northern Italy. Baseline questionnaire data were linked with electronic nursing records, workforce data, and ward-level administrative data. Initial use was defined as documentation of at least one ND during follow-up. Results: The primary cohort included 144 nurses, of whom 122 (84.7%) documented at least one ND. Greater work exposure was associated with initial use (OR = 1.71, 95% CI [1.12, 2.60]). After additional adjustment for the overall PES-NWI, behavioural beliefs (OR = 1.93, 95% CI [1.09, 3.40]) and normative beliefs (OR = 2.09, 95% CI [1.16, 3.76]) were associated with initial use after multiplicity correction. These associations were attenuated and non-significant in the sensitivity cohort. Control beliefs, attitudes, and behavioural intention showed no consistent associations with initial use. No personal determinant was associated with documentation intensity. The nursing practice environment was not independently associated with either outcome. Conclusions: Initial ND use was associated with work exposure and, in the primary cohort, with behavioural and normative beliefs. Baseline individual and organisational factors did not explain documentation intensity, supporting a distinction between initiation and subsequent extent of use.