Standard ANOVA should not strictly be used on questionnaire data since the responses are on an ordinal scale.
Despite these issues, Brimblecombe et al. [100] used on-site questionnaires to identify soiling levels that are publicly unacceptable.
The study used on-site questionnaires to collect data in six public park playgrounds in the U.S. and Denmark, to reveal cultural similarities and differences.
Respondents were assured of confidentiality, and only study unique identification numbers were used on the questionnaires.
Only these numbers were used on the questionnaires, for data entry, and in the subsequent analysis instead of names.
We assured the participants that their responses would be kept confidential [ 56] and that code numbers rather than names would be used on the questionnaires.
Another threat to the validity is the single generic question about BNP used on the questionnaire.
Confidentiality of the information was assured; data was collected anonymously and only an identity number was used on each questionnaire.
Generic terms for services were used on the questionnaire, such as 'telephone help line' rather than NHS Direct, and use of walk in centres was collected by respondents writing down which 'other service' they had used.
The survey was proposed to 82 hospitals in the region using on-line or paper questionnaires forms.
