Table 2

Summary of the questionnaire results.

Question 1 „comfortable"

Question 2 „strange"

Question 3 „too long"

Question 4 „do it again"


healthy

patients

healthy

patients

healthy

patients

healthy


number of respondents

68

22

68

21

66

22

61


means or percentages

3.03*** 1

2.73** 1

33.8%*** 2

28.6%*** 2

12.1%*** 2

0%

93.4%*** 2


healthy vs. patients

ns

ns

ns

N/A


effect of


Question 2 „strange"

ns

ns

--

--

*** 3

ns

** 3


Question 3 „too long"

ns

ns

*** 3

ns

--

--

*** 4


Question 4 „do it again"

ns

ns

** 3

ns

*** 4

N/A

--


having a DTI scan

ns

N/A

ns

N/A

ns

N/A

ns


study5

ns

N/A

ns

N/A

ns

N/A

ns


study duration6

ns

N/A

ns

N/A

ns

N/A

ns


gender

* 7

* 7

ns

ns8

ns

ns

ns


males

2.63

3.12

45.2%

25%

10%

0%

88.9%


females

3.34

1.40

24.3%

40%

13.9%

0%

97.1%


Abbreviations: * p < .05; ** p < .01; *** p < .001; ns not significant; N/A not applicable

Footnotes: 1 one-sample t-test versus mean of 4; 2 χ2 test versus 0% (Questions 2 and 3) or 100% (Question 4); 3 people noting something strange more often found the session too long and were less willing to participate again; 4 people finding session too long are less willing to participate again; 5 tested by one-way ANOVA (Question 1) or χ2 test (Questions 2–4); 6 tested by Pearson's r (Question 1) or by Spearman's rho (Questions 2–4); 7 significant interaction (p = .002) between gender and participant group as assessed by 2 × 2 ANOVA; 8 trend with p < .07. For further statistical details see main text.

Healthy refers to the sample of healthy subjects and patients to the sample of stroke patients. For question 1, mean ratings of the 7-point scale are given. For questions 2 to 4 the data refer to the proportion of "yes" answers (i.e. feeling something strange, considering the scanning as too long, and would like to participate again). The rows "effect of" indicate whether the named factors significantly affected the answer to the questionnaire items. For instance, Question 1 was answered the same, irrespective of the answer on Question 2, while Question 3 differed in healthy controls depending on the answer on Question 2. Note that the number of males and females is not balanced. Question 4 was not presented to the patients.

Szameitat et al. BMC Medical Imaging 2009 9:14   doi:10.1186/1471-2342-9-14

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