Tables at a glance

Table 1

Table 2

Table 3

Table 4

Figures at a glance

Figure 1

Table 1

Anomaly	Number	%
Chronic cervicitis	11	68.8
Epidermoid papilloma	3	18.8
Glandular hyperplasia	1	6.2
Malpighian acanthosis	1	6.2
Total	16	100

Table 1:Cervical non-dysplastic abnormalities

Table 2

		Cervical dysplasia on biopsy specimen
		Present	Absent	Total
VIA	Positive	33 (a)	11 (b)	44 (a+b)
	Negative	41 (c)	12 (d)	53 (c+d)
	Total	74 (a+c)	23 (b+d)	97 (a+b+c+d)

Table 2:Accuracy of VIA in diagnosing cervical dysplasia

Sensitivity (SS): a/a+c=33/74 = 44.6%
Specificity (SP): d/b+d=12/23 = 52.2%
Positive predictive value: a/a+b =33/44 =75%
Negative predictive value: d/c+d =12/53 =22.6%
Likehood ratio for a positive test: SS/1-SP= 0.93
Likehood ratio for a negative test: 1-SS/SP= 1.06

Table 3

		Cervical dysplasia on biopsy specimen
		Present	Absent	Total
VILI	Positive	67 (a)	20 (b)	87 (a+b)
	Negative	07 (c)	03 (d)	10 (c+d)
	Total	74 (a+c)	23 (b+d)	97 (a+b+c+d)

Table 3:Accuracy of VILI in diagnosing cervical dysplasia

Sensitivity (SS): a/a+c= 67/74= 90.5%
Specificity (SP): d/b+d=3/23 = 13.0%
Positive predictive value: a/a+b = 67/87=77.0%
Negative predictive value: d/c+d = 03/10=30%
Likehood ratio for a positive test: SS/1-SP= 1.04
Likehood ratio for a negative test: 1-SS/SP=0.73

Table 4

		Cervical dysplasia on biopsy specimen
		Present	Absent	Total
VIA-VILI	At least one positive	70 (a)	20 (b)	90 (a+b)
	Both negative	04 (c)	03 (d)	07 (c+d)
	Total	74 (a+c)	23 (b+d)	97 (a+b+c+d)

Table 4:Accuracy of both methods in diagnosing cervical dysplasia

Sensitivity (SS): a/a+c= 70/74= 94.6%
Specificity (SP): d/b+d=3/23 = 13.04%
Positive predictive value: a/a+b = 70/90=77.8%
Negative predictive value: d/c+d = 3/7=42.9%
Likehood ratio for a positive test: SS/1-SP=1.08
Likehood ratio for a negative test: 1-SS/SP=0.41

FIGURE 1

Figure 1:Flowchart showing screening sequences: Among women with macroscopic normal cervices, 34 cases of VIA negative were positive at VILI. Biopsies revealed 31 dysplasia and 3 normal results