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Questionnaires with missing answers for more than 2 items were excluded from further analysis.
Among all employed axSpA RS patients who were required to answer WPS Q2 through Q4, the completion rates at baseline were also high, with only two (0.9%) missing answers for Q2 and three (1.3%) missing answers for Q3 and Q4.
There were 2.7% with missing answers for at least one of the two questions and 1.7% with both.
The mean percentage of missing answers for a given NIPS question was 0.5% in 2009 (range 0%to4.5%5%) and 0.15% in 2010 (range 0%too 1.75%).
The response rate for both the MOS-HIV and SF-12 was 100%, with no missing answers for any of the questions.
The mean percentage of missing answers for the knowledge questions was 0.4% in 2009 (range 0%to3%3%) and 0.2% in 0.17% in 2010 (range 0%to1.5%5%).
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c No. of missing answer for the potential prognostic factor.
If the classification differed according to the replaced value, participants were considered as having a missing answer for the dimension.
b Numbers of subjects are less than the study population (n=680) due to missing answer for prognostic factors in the backward selection procedures.
A value equal to the subject's average score in child or family section, whichever the missing answer belonged to, was given to the missing answer for validity analysis purposes.
The criterion for a complete assessment was no more than one missing answer for GDS-15 and PGCMS, respectively, i.e. answering 14 questions or more on the GDS-15, and 16 or more in the PGCMS.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com