Validation of the state version questionnaire on autonomic regulation (state-aR) for cancer patients

OBJECTIVES Current quality of life inventories used in oncology mainly measure the effects of chemo- or radiotherapy alongside functional and role scales. A new approach is to measure the autonomic state of regulation with the trait-inventory of autonomic regulation (Trait-aR). Loss of Trait-aR has been shown in different medical conditions such as breast cancer (BC) but not in colorectal cancer patients (CRC). In this paper we report the validation of a new state autonomic regulation scale (State-aR) of the last week. METHODS Study 1 included 114 participants: (41 women/16 men with cancer and 57 age- and gender-matched healthy people) to conduct a reliability-, factor- and validity-analysis. Concurrent and convergent validity was evaluated with Trait-aR, Fatigue-Numerical-Scale, Hospital Anxiety and Depression Scale (HADS-D) and the self-regulation scale, 65 participants were retested. Study 2 completed 42 participants: 17 with BC and 25 with CRC receiving chemotherapy. The State-aR was administered prior, during and after chemotherapy for measuring responsiveness. RESULTS The factor analysis loaded to four subscales of State-aR (rest-activity, orthostatic-circulatory, thermo-sweating and digestive regulation) with a: Cronbach-α r(α) = 0.77?0.83 and a test-retest-reliability r(rt) = 0.60?0.80. The sum- and subscales correlated with their concurrent subscales in the Trait-aR (0.48?0.74) and with the sum-scale moderately with all convergent criteria (r = 0.41?-0.44; p <0.001). During chemotherapy the State-aR-sum and rest-activity-scale decreased significantly compared to the change in the Trait-aR (p <0.05). CONCLUSIONS These findings support that the state autonomic regulation scale has satisfactory to good reliability, good validity and acceptable responsiveness in the context of chemotherapy treatment.