BACKGROUND CONTEXT

Idiopathic scoliosis (IS) can significantly alter the quality of life of adolescents. Some of the available questionnaires in French measuring the quality of life in this population show weak psychometric properties. The newly developed Italian Spine Youth Quality of Life (ISYQOL) questionnaire promises better properties.

PURPOSE

To provide a French-Canadian version of the ISYQOL and to verify its psychometric characteristics.

STUDY DESIGN

Prospective validation of a cross-cultural adaptation of the ISYQOL questionnaire.

PATIENT SAMPLE

A total of 111 participants with idiopathic scoliosis (77.5% female, 10–18 years old, mean Cobb angle=28°) were included in the study.

OUTCOME MEASURE

The French-Canadian version of the Italian Spine Youth Quality of Life (ISYQOL-F) questionnaire.

MATERIALS AND METHODS

The ISYQOL was translated into French using a forward-backward approach. We then verified the understanding of the translated items with two scoliosis experts and 10 adolescents. Afterward, 111 adolescents with IS were recruited by convenience at the scoliosis clinic and they completed the ISYQOL on three occasions (before seeing the specialist, 1 week, and 2 weeks after). Cronbach's alpha, intra-class (ICC), and Pearson correlation coefficients were used to respectively determine internal consistency, test-retest reliability, and concurrent validity with the SRS-22r and SF-12. The standard error of measurement (SEM) and 95% confidence minimal detectable change (MDC₉₅) were also calculated. The ceiling effect was quantified as the percentage of participants who scored the maximum on ISYQOL-F.

RESULTS

The ISYQOL-F showed good internal consistency with a Cronbach alpha of 0.81 and 0.85 respectively for items 1–13 (n=55; ISYQOL-F mean score ± SD = 63.9±13.5) and 1–20 (n=56; ISYQOL-F mean score ± SD=60.7±10.3). Test-retest reliability was excellent (ICC_3,1=0.94). The SEM is 3.1 and the MDC₉₅ is 8.6. Correlations between ISYQOL-F and SRS-22r and between ISYQOL-F and SF-12 were moderate for total scores (r=0.56 and 0.50 respectively, p<.001), but low for each domain (between 0.20 and 0.48, p<.05). No significant ceiling effects were observed for ISYQOL-F (≤2.5%). In contrast, ceiling effects ranged from 3.6% to 30.6% for SRS-22r and 0%–68.5% for SF-12.

CONCLUSIONS

The internal consistency and reliability of ISYQOL-F are good. The total score correlates moderately with the SRS-22r and SF-12. Unlike SRS-22r, the ISYQOL-F does not appear to have a ceiling effect. The ISYQOL–F may thus be suitable to assess quality of life in a population of French-Canadian adolescents with IS.

中文翻译：

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意大利脊柱青年生活质量 (ISYQOL) 问卷的跨文化法国-加拿大适应和心理测量评估

背景语境

特发性脊柱侧凸 (IS) 可以显着改变青少年的生活质量。一些可用的法语问卷测量该人群的生活质量，显示出较弱的心理测量特性。新开发的意大利脊柱青年生活质量 (ISYQOL) 问卷有望提供更好的性能。

目的

提供 ISYQOL 的法语-加拿大版本并验证其心理测量特征。

学习规划

ISYQOL 问卷的跨文化改编的前瞻性验证。

患者样本

共有 111 名患有特发性脊柱侧弯的参与者（77.5% 为女性，10-18 岁，平均 Cobb 角 = 28°）被纳入研究。

结果测量

意大利脊柱青年生活质量 (ISYQOL-F) 问卷的法加版。

材料和方法

ISYQOL 使用向前向后的方法被翻译成法语。然后，我们与两名脊柱侧凸专家和 10 名青少年验证了对翻译项目的理解。之后，在脊柱侧凸诊所方便地招募了 111 名患有 IS 的青少年，他们在三种情况下完成了 ISYQOL（看专科医生之前、1 周和之后 2 周）。Cronbach 的 alpha、组内 (ICC) 和 Pearson 相关系数分别用于确定 SRS-22r 和 SF-12 的内部一致性、重测信度和同时有效性。还计算了测量的标准误差 (SEM) 和 95% 置信度的最小可检测变化 (MDC ₉₅ )。天花板效应被量化为在 ISYQOL-F 上得分最高的参与者的百分比。

结果

The ISYQOL-F showed good internal consistency with a Cronbach alpha of 0.81 and 0.85 respectively for items 1–13 (n=55; ISYQOL-F mean score ± SD = 63.9±13.5) and 1–20 (n=56; ISYQOL-F mean score ± SD=60.7±10.3). Test-retest reliability was excellent (ICC_3,1=0.94). The SEM is 3.1 and the MDC₉₅ is 8.6. Correlations between ISYQOL-F and SRS-22r and between ISYQOL-F and SF-12 were moderate for total scores (r=0.56 and 0.50 respectively, p<.001), but low for each domain (between 0.20 and 0.48, p<.05). No significant ceiling effects were observed for ISYQOL-F (≤2.5%). In contrast, ceiling effects ranged from 3.6% to 30.6% for SRS-22r and 0%–68.5% for SF-12.

CONCLUSIONS

ISYQOL-F的内部一致性和信度良好。总分与 SRS-22r 和 SF-12 适度相关。与 SRS-22r 不同，ISYQOL-F 似乎没有天花板效应。因此，ISYQOL–F 可能适合评估患有 IS 的法裔加拿大青少年的生活质量。