E Keane, N Moore, B Leamy, A Scally, M F McEntee
Identifying barriers to Irish traveller women attending breast screening
Radiography (London, England : 1995)
abstract cohens 1988 work power analysis connects values r ddifference means standard deviation units qualitative descriptors small medium large paper discusses pros cons using qualitative nonmathematical descriptors strength association effect size data interpretation proposes extension cohens classification scheme addition large descriptive category paper presents advantages odds ratio analysis categorical data argues increased use odds ratio develops qualitative descriptors effect size odds ratio 15 1 small effect weak association 25 1 medium moderate 4 1 large strong 10 1 large strong percentages 15 85 qualitative descriptors effect size utilized difference percentages 7 percentage points small 18 points medium 30 points large 45 points large treated flexible guidelines rather rigid rules sensitive context substantive area qualitative description facilitates data interpretation communication particularly nonstatistical audience beginning students administrators practitioners