Background

The idiopathic pulmonary fibrosis-specific version of the St George's Respiratory Questionnaire (SGRQ-I) is a valid tool to assess health-related quality of life in patients with interstitial lung diseases (ILDs).

Objective

To translate and cross-culturally adapt the SGRQ-I to Brazilian-Portuguese, and to assess its measurement properties.

Methods

Phase one consisted of the translation and cross-cultural adaptation of the questionnaire. In phase two, intra- and inter-assessor reliability (intraclass correlation coefficient [ICC]), internal consistency (Cronbach's α), minimal detectable change (MDC), ceiling/floor effects, convergent validity (correlation with SF-36 questionnaire), and discriminative validity (according to clinical characteristics) were investigated.

Results

No significant adaptations were needed during the translation process of the SGRQ-I. In phase two, 30 patients with ILD were included (15 men; age 59 ± 10 years; Forced Vital Capacity 73 [61–80]%predicted). The total score on the SGRQ-I presented excellent intra-assessor (ICC: 0.93; 95%CI: 0.85, 0.97]) and inter-assessor (ICC: 0.88; 95%CI: 0.77, 0.94) agreement. Internal consistency was considered adequate for the domains impact, activity, and total score (0.79<α<0.88) but not for symptoms (α=0.43). MDC was 12.8 points and ceiling/floor effects were found in only 3% of patients. No discriminative validity was observed, but there was adequate convergent validity.

Conclusion

The results provide preliminary evidence of adequate measurement properties and validity of the Brazilian-Portuguese version of the SGRQ-I for patients with ILDs.

中文翻译：

---

圣乔治呼吸问卷 (SGRQ-I) 巴西-葡萄牙语版本特发性肺纤维化特异版本针对间质性肺病患者的翻译、跨文化适应和测量特性

背景

圣乔治呼吸问卷 (SGRQ-I) 特发性肺纤维化特异性版本是评估间质性肺病 (ILD) 患者健康相关生活质量的有效工具。

客观的

将 SGRQ-I 翻译和跨文化适应巴西-葡萄牙语，并评估其测量特性。

方法

第一阶段包括问卷的翻译和跨文化改编。在第二阶段，评估者内部和评估者之间的可靠性（组内相关系数 [ICC]）、内部一致性（Cronbach's α）、最小可检测变化（MDC）、天花板/地板效应、收敛效度（与 SF-36 问卷的相关性），和区分有效性（根据临床特征）进行了调查。

结果

在 SGRQ-I 的翻译过程中不需要进行重大调整。在第二阶段，包括 30 名 ILD 患者（15 名男性；年龄 59 ± 10 岁；用力肺活量 73 [61-80]% 预测）。SGRQ-I 的总分表现出优秀的内部评估者 (ICC: 0.93; 95%CI: 0.85, 0.97]) 和评估者间 (ICC: 0.88; 95%CI: 0.77, 0.94) 的一致性。内部一致性被认为足以满足领域影响、活动和总分（0.79<α<0.88），但不适用于症状（α=0.43）。MDC 为 12.8 分，仅 3% 的患者出现天花板/地板效应。没有观察到区分效度，但有足够的收敛效度。

结论

结果为 ILD 患者的巴西-葡萄牙版本 SGRQ-I 的充分测量特性和有效性提供了初步证据。