Table 3 Prevalence of publications using a qualitative or quantitative research paradigm, in absolute numbers and as a percentage of total empirical publications.

Method	Frequency	%
Quantitative	281	64.6
Descriptive survey	233	53.6
Longitudinal prospective survey	13	3
Observational prospective study	15	3.5
Observational retrospective study	11	2.5
Other quantitative	9	2.1
Qualitative	140	32.2
Interviews	89	20.5
Content analysis	11	2.5
Focus group	16	3.7
Participant observation	20	4.6
Other qualitative	4	0.9
Combination of qualitative and quantitative design	14	3.2
Descriptive survey & content analysis	3	0.7
Descriptive survey & interviews	8	1.8
Other combination of quantitative and qualitative methods	3	0.7
Total	435	100