The revised Helping Alliance Questionnaire (HAq-II) is among the most used instruments that measure therapeutic alliance. Despite its use in research, this instrument is not validated for the Brazilian population. The aim of this study was to explore the evidence of validity of the HAq-II based on the internal structure in a sample of Brazilian psychiatric patients. An ambulatory convenience sample of 204 patients with major depressive disorder (MDD) and 81 patients with obsessive–compulsive disorder (OCD) was randomized between two different types of treatment. The HAq-II was completed by patients (patient version) and by 33 therapists who performed the interventions (therapist version) between the second and third sessions. We used confirmatory factor analysis (CFA) to investigate two models: (1) a one-dimensional therapeutic alliance model and (2) a two-dimensional model considering the factors ‘positive alliance’ and ‘negative alliance’. The internal consistency of the HAq-II was measured by Cronbach's alpha. To investigate discriminant validity, we used the t-test for independent samples, ANOVA and Pearson's correlation coefficient. The analysis showed that the best model of the instrument was one-dimensional. Cronbach's alpha for both versions displayed values above 0.89. The Brazilian version of the HAq-II presented properties similar to those found in the original version. However, studies related to the one-dimensional model with other samples are necessary.

中文翻译：

---

基于巴西临床样本内部结构的修订版帮助联盟问卷的有效性证据

修订后的帮助联盟问卷 (HAq-II) 是衡量治疗联盟最常用的工具之一。尽管它用于研究，但该仪器并未针对巴西人口进行验证。本研究的目的是根据巴西精神病患者样本的内部结构探索 HAq-II 有效性的证据。204 名重度抑郁症 (MDD) 患者和 81 名强迫症 (OCD) 患者的门诊便利样本被随机分配到两种不同类型的治疗中。HAq-II 由患者（患者版）和在第二次和第三次会议之间进行干预的 33 名治疗师（治疗师版）完成。我们使用验证性因子分析 (CFA) 来研究两个模型：(1)一维治疗联盟模型和(2)考虑“正联盟”和“负联盟”因素的二维模型。HAq-II 的内部一致性通过 Cronbach's alpha 测量。为了研究区分效度，我们使用独立样本的t检验、ANOVA 和 Pearson 相关系数。分析表明，该仪器的最佳模型是一维的。两个版本的 Cronbach 的 alpha 值均高于 0.89。巴西版 HAq-II 具有与原始版本相似的特性。然而，与其他样本的一维模型相关的研究是必要的。