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 
Pvalue 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 MannWhitney U test. The two with p < 0.05 are in bold. ^{a }pvalue of MannWhitney U test is 0.020. ^{b}pvalue of MannWhitney U test is 0.039. 

Nieminen et al. BMC Medical Research Methodology 2006 6:42 doi:10.1186/14712288642 