Benson Philip E, Cunningham Susan J, Shah Nahush, Gilchrist Fiona, Baker Sarah R, Hodges Samantha J, Marshman Zoe
a Academic Unit of Oral Health & Development, School of Clinical Dentistry , University of Sheffield , UK.
b Orthodontic Department , University College London Eastman Dental Institute , UK.
J Orthod. 2016 Mar;43(1):14-23. doi: 10.1080/14653125.2015.1114223. Epub 2016 Jan 8.
To test the items, identified through qualitative inquiry that might form the basis of a new Malocclusion Impact Questionnaire (MIQ) to measure the oral health-related quality of life (OHQoL) of young people with malocclusion.
Piloting with 13 young people reduced the number of items from 37 to 28. Cross-sectional testing involved a convenience sample aged 10-16 years, attending the Orthodontic Department of the Charles Clifford Dental Hospital, Sheffield. The fit and function of the initial MIQ questions were examined using item response theory.
184 participants (113 females; 71 males) completed a questionnaire (response 85%), seven participants were excluded due to missing responses. The mean age of participants was 12·9 years (SD 1·4) and they had a wide range of malocclusions. The majority were White British (67·4%). Data from 47 participants were used to analyse test-retest reliability. Rasch analysis was undertaken, which further reduced the number of items in the questionnaire from 28 to 17. Unidimensionality of the scale was confirmed. The analysis also identified that the original 5-point response scale could be reduced to three points. The new measure demonstrated good criterion validity (r = 0·751; P < 0·001) and construct validity with the two global questions ('Overall bother' ρ = 0·733 and 'Life overall' ρ = 0·701). Internal consistency (Cronbach's alpha = 0·906) and test-retest reliability Intraclass correlation coefficient (ICC = 0·78; 95% CI 0·61-0·88) were also good.
Cross-sectional testing has shown the new MIQ to be both valid and reliable. Further evaluation is required to confirm the generalisability as well as the ability of the new measure to detect change over time (responsiveness).
对通过定性调查确定的条目进行测试，这些条目可能构成一个新的错颌畸形影响问卷（MIQ）的基础，以测量错颌畸形青少年的口腔健康相关生活质量（OHQoL）。
对13名青少年进行预试验，将条目数量从37个减少到28个。横断面测试涉及一个便利样本，年龄在10至16岁之间，他们前往谢菲尔德查尔斯·克利福德牙科医院正畸科就诊。使用项目反应理论检查初始MIQ问题的拟合度和功能。
184名参与者（113名女性；71名男性）完成了问卷（回复率85%），7名参与者因回复缺失被排除。参与者的平均年龄为12.9岁（标准差1.4），他们有多种错颌畸形类型。大多数是英国白人（67.4%）。47名参与者的数据用于分析重测信度。进行了拉施分析，进一步将问卷中的条目数量从28个减少到17个。确认了量表的单维度性。分析还发现，原来的5点反应量表可以减少到3点。新的测量方法显示出良好的效标效度（r = 0.751；P < 0.001），并且与两个总体问题具有结构效度（“总体困扰”ρ = 0.733，“整体生活”ρ = 0.701）。内部一致性（克朗巴哈α系数 = 0.906）和重测信度组内相关系数（ICC = 0.78；95%置信区间0.61 - 0.88）也很好。
横断面测试表明新的MIQ有效且可靠。需要进一步评估以确认其普遍性以及新测量方法检测随时间变化的能力（反应性）。
