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The response category of 'unsure/declined to answer' was included as a valid response for the purposes of data analysis.
There was a significant relationship between valid response for sunlight as a source of vitamin D with younger age (p < 0.05; Figure 2), but not with occupation.
First, they felt that the new format was easier to use as they were better able to focus on the items and select a valid response for each time frame.
Similarly, there was no relationship between those who gave a valid response for sunlight being a source of vitamin D and those who thought they had enough exposure to sunlight (chi-square p = not significant).
4. When multiple values are checked inappropriately for a response category, – if it is a critical item, call the respondent to obtain a valid response, – for all other questions, if the marks are NOT adjacent, flip a coin.
Similar(55)
They are based on 126 valid responses for the "perceived amount of reverberation" test and 128 valid responses for the "overall quality" test1.
The survey had a 35% response rate, yielding valid responses for 13 countries.
A minimum response rate of 60% will permit 600 valid responses for the analysis.
The totals used for the analysis were the number of valid responses for each question.
Collection of data occurred between March and July 2011, producing 415 valid responses for analysis.
Valid responses for the individual questionnaire items included in the analysis ranged from 108 to 115.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com