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Table 4 Capture-recapture estimates of total numbers of cases, sensitivities of each source, incidence estimates and 95% confidence intervals

From: Completeness of hepatitis, brucellosis, syphilis, measles and HIV/AIDS surveillance in Izmir, Turkey

  Chapman's formula Chao's lower bound estimator
  Total number of cases in population Sensitivity lab % Sensitivity notifications % Incidence
(per 100,000)
Total number of cases in population Sensitivity lab% Sensitivity notifications % Incidence (per 100,000)
Hepatitis A 1852
(1665-2040)
30
(28-34)
32
(29-35)
52.8
(47.5-58.2)
1858
(1669-2047)
30
(27-34)
32
(29-35)
53.0
(47.6-58.4)
Hepatitis B         
   IgM anti-HBc 1831
(1399-2263)
21
(17-27)
12
(10-16)
52.2
(39.9-64.5)
1989
(1502-2477)
19
(15-25)
11
(9-15)
56.7
(42.8-70.6)
Hepatitis C         
   dialysis & gastroenterology omitted 2081
(1901-2260)
84
(78-92)
4
(4-5)
59.3
(54.2-64.5)
11359
(8997-13721)
15
(13-20)
1
(1-1)
323.9
(256.6-391.3)
Brucellosis         
   WHO criteria 362
(299-425)
42
(36-51)
32
(27-39)
10.3
(8.5-12.1)
371
(304-439)
41
(34-50)
31
(26-38)
10.6
(8.7-12.5)
   Agglutination < 1/80 545
(468-622)
56
(49-66)
21
(19-25)
15.5
(13.4-17.7)
688
(572-804)
45
(38-54)
17
(14-20)
19.6
(16.3-22.9)
Syphilis         
   WHO criteria 331
(283-378)
61
(53-71)
26
(23-30)
9.4
(8.1-10.8)
396
(327-465)
51
(43-61)
22
(19-26)
11.3
(9.3-13.3)
   notified lab cases not meeting WHO criteria included 274
(250-298)
79
73-87)
31
(29-34)
7.8
(7.1-8.5)
338
(293-382)
64
(57-74)
25
(23-29)
9.6
(8.4-10.9)