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Exact(13)
Answer options for the question on cultural background were open a text box was provided.
The answer options for this are 'not at all' (0), 'only a little' (1), 'quite a lot' (2) and 'a great deal' (3).
The three answer options for eye problems were: no problems; problems caused by diabetes, but no blindness; and blindness as a result of diabetes.
Answer options for both questions were as follows: seldom or not at all, about once a month, about once a week, and almost daily.
Questions were asked with few answer options, for example 'never sometimes often always' or had dichotomous options, e.g., with the questions concerning night and shift work.
All participants were also questioned about their lifetime experience and frequency of use of marijuana and cigarettes, with similar answer options for frequency as described above.
Similar(47)
In some cases, a given misconception was expressed in more than one answer option for the same item.
They missed an answer option for somebody who had LBP only on one day.
*Numbers vary owing to missing values, incorrectly completed surveys, or because participants selected a "prefer not to answer" option for income.
We report the extent and characteristics of missing data for variables of interest in the flow chart (figure 1) and in web appendix B. *Numbers vary owing to incorrectly completed surveys, participants selecting a "prefer not to answer" option for income, and participants failing to attend for blood tests.
Differences in income were noted between women who returned for final weight measurement and those who did not, although participants were given a "prefer not to answer" option for income that led to a high number of missing values for this variable.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com