Table 1.

Lack of information on ethical approval in health and social sciences articles with Swedish research persons

Study characteristics	Health sciences, somatic focus (n = 200)		Health sciences, non-somatic focus (n = 200)			Social sciences (n = 200)		Total (n = 600)
	Information missing	Fisher’s exact test, p-value	Information missing	Fisher’s exact test,p-value		Information missing	Fisher’s exact test, p-value	Information missing	Fisher’s exact test, p-value
All articles	12/200; 6%	–	21/200; 11%	–		54/200; 27%	–	87/600; 15%	–
Study type
Intervention	2/77; 3%	Non-sign	2/20; 10%	Non-sign		3/24; 13%	Non-sign	7/121; 5%	< 0.01
Observation	10/123; 8%		19/180; 11%			51/176; 29%		80/479; 17%
No. of authors
1–2	0/5; 0%	a	6/16; 38%	< 0.01		24/57: 43%	< 0.01	30/78: 38%	< 0.001
≥ 3	12/195; 6%		15/184: 8%			30/143; 20%		57/522; 11%
University
With medical schoolb	12/194; 6%	a	12/165; 7%	< 0.01		28/116; 27%	Non-sign	54/475; 11%	< 0.001
Otherc	0/6; 0%		9/35; 26%			26/84; 31%		35/125; 28%

Non-sign. p > 0.05

^aNot possible to calculate because of low numbers

^bIncluding university hospitals

^cIncluding 7 articles from non-academic institutions