In previous studies, test-retest reliabilities of those questionnaires were measured and results were very satisfactory [ 12, 13].
Of those questionnaires returned; 98% of parents remembered consenting, 95% felt they were given enough time to make their decision and 96% felt they received enough information.
To assess repeatability, patients were asked to fill out the VAS, RMQ and SF12, and at least 30 min. after having answered the NDI and COM the patient was given a second version of those questionnaires.
In conclusion, this study shows that the Spanish versions of both NDI and COM are comprehensible and reliable, that Spanish versions of NDI, NPQ and COM are internally consistent and valid, and that it is feasible to use any of those questionnaires in routine practice.
In addition, they show that NDI, NPQ and COM are internally consistent and valid instruments to measure neck pain patients' disability, that floor and ceiling effects are not a major concern for any of those questionnaires and that they can be used in routine clinical conditions.
Ten students (1.9% of all invited) refused to participate (1.7% of those receiving questionnaire A and 2.1% of those receiving questionnaire B) and 509 were evaluated, approximately 50% of the total number of students in the institution who were enrolled in diurnal classes.
Of these questionnaires, those with a completion rate of more than 90% were regarded as appropriate for analysis, resulting in 94 (78.3%) complete data sets for analysis.
The population in our study is a general working population, and only approximately 50% of those the questionnaire was aimed at ended up in the final regression analyses.
As part of the questionnaire, those industry professionals were asked to name "the most unusual music requests they'd received during the course of preparing a funeral".
Respondents of the questionnaire were those who were 12 years or older, or the parents of those who were younger than 12.
