2. A new test has been developed for diagnosing Rheumatoid Arthritis. The test was evaluated in four communities with the following results Table-1:

Table 1: Results of a new screening test for Rheumatoid Arthritis in Four Communities

Community A

Rheumatoid Arthritis

1

F 21 HEA520 80 & 90 Assignment Five.docx

	Present	Absent	Total
Test Result +	887	888	1775
Test Result --	99	7989	8088
	986	8877	9863

Community B	Rheumatoid Arthritis
	Present	Absent	Total
Test Result +	1485	385	1870
Test Result --	165	3465	3630
	1650	3850	5500

Community C	Rheumatoid Arthritis
	Present	Absent	Total
Test Result +	3634	269	3903
Test Result --	404	2423	2827
	4038	2692	6730

Community D	Rheumatoid Arthritis
	Present	Absent	Total
Test Result +	2866	56	2922
Test Result --	318	506	824
	3184	562	3746

2.3. Graph the sensitivity percentages against the prevalence for the communities. No need to use a graph paper! (1 point)

2.5. Graph the specificity percentages against the prevalence for the communities. No need to use a graph paper! (1 point)

2.7. Graph the positive predictive values against the prevalence for the communities. No need to use a graph paper!