Table 2

Distribution of the reporting quality variables and median of the number of citations received by the publishing journal.

AGP

AJP

BJP

NJP

Total

P-value of chi square test






N

(%)

Md

N

(%)

Md

N

(%)

Md

N

(%)

Md

N

(%)


Research question

< 0.001

▪not stated

18

(20.0)

50.5

38

(28.1)

32

78

(42.4)

19.5

21

(53.8)

1

155

(34.6)

▪stated

72

(80.0)

73.5

97

(71.9)

33

106

(57.6)

20.5

18

(46.2)

1

293

(65.4)

Primary outcome

0.004

▪not stated

20

(22.2)

49.5

28

(20.7)

36

45

(24.5)

20

19

(48.7)

0

112

(25.0)

▪stated

70

(77.8)

74

107

(79.3)

32

139

(75.5)

20

20

(51.3)

1.5

336

(75.0)

Sample size

0.047

▪not reported

12

(13.3)

58

16

(11.9)

33.5

42

(22.8)

16

8

(20.5)

1

78

(17.4)

▪reported

78

(86.7)

65.5

119

(88.1)

33

142

(77.2)

23

31

(79.5)

1

370

(82.6)

Incomplete description of procedures

< 0.001

▪yes

7

(7.8)

63

21

(15.6)

24 a

66

(35.9)

16 b

19

(48.7)

1

113

(25.2)

▪no

83

(92.2)

65

114

(84.4)

34

118

(64.1)

24

20

(51.3)

0.5

335

(74.8)

All

90

135

184

39

448


The statistical significance of differences of the medians between variable categories was tested with Mann-Whitney U test. The two with p < 0.05 are in bold.

a p-value of Mann-Whitney U test is 0.020.

bp-value of Mann-Whitney U test is 0.039.

Nieminen et al. BMC Medical Research Methodology 2006 6:42   doi:10.1186/1471-2288-6-42

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