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Table 3 Selection bias in non-acceptorsa of PMTCT HIV testingb

From: Is Zimbabwe ready to transition from anonymous unlinked sero-surveillance to using prevention of mother to child transmission of HIV (PMTCT) program data for HIV surveillance?: results of PMTCT utility study, 2012

Site

Number and HIV prevalence according to surveillance testing among women who did and did not accept PMTCT HIV testing (n = 16,719)

Number and HIV prevalence according to surveillance testing among women who accepted PMTCT HIV testing (n = 16,597)

Percent biasc

Banket

332

16.6

330

16.1

−3.1 %

Beitbridge

303

18.5

294

16.3

−11.6 %

Bindura

321

16.5

320

16.3

−1.6 %

Binga

316

5.4

304

4.3

−20.4 %

Chimhanda

319

9.4

315

9.2

−2.0 %

Chinhoyi

319

11.9

318

11.6

−2.3 %

Chiredzi

313

16.3

313

16.3

0.0 %

Chivi

310

9.7

307

9.8

0.9 %

Concession

319

13.2

315

12.4

−6.0 %

Epworth

339

19.5

339

19.5

0.0 %

Filabusi

308

19.2

303

17.8

−7.0 %

Glen View

333

10.2

333

10.2

0.0 %

Gokwe

325

9.9

325

9.9

0.0 %

Guruve

324

9.6

323

9.6

0.3 %

Gutu

320

11.9

319

11.6

−2.4 %

Gwanda

282

18.8

277

18.1

−3.9 %

Gweru

306

13.1

304

12.5

−4.4 %

Hatcliffe

330

8.5

329

8.2

−3.2 %

Hauna

215

8.4

214

7.9

−5.1 %

Hwedza

308

10.7

305

10.5

−2.1 %

Inyathi

306

16.7

303

16.5

−1.0 %

Kadoma

320

13.1

318

12.6

−4.2 %

Karanda

326

4.0

324

3.4

−14.8 %

Kariba

319

11.9

318

11.6

−2.3 %

Kuwadzana

595

11.6

595

11.6

0.0 %

Kwekwe

330

13.3

324

12.7

−5.1 %

Mabvuku

89

12.4

89

12.4

0.0 %

Makumbe

317

18.3

313

17.9

−2.2 %

Marondera

319

15.1

314

14.3

−4.8 %

Masvingo

317

11.0

316

10.8

−2.5 %

Murambinda

303

9.9

300

9.3

−5.8 %

Murehwa

290

15.5

290

15.5

0.0 %

Musume

272

16.9

272

16.9

0.0 %

Mutambara

285

7.4

285

7.4

0.0 %

Mutoko

330

14.2

330

14.2

0.0 %

Mvuma

300

13.3

298

12.8

−4.4 %

Ndanga

321

13.4

318

12.6

−6.1 %

Neshuro

315

11.1

315

11.1

0.0 %

Nkayi

237

17.3

219

13.7

−20.8 %

Nkulumane

551

13.6

551

13.6

0.0 %

Nyamandlovu

309

19.4

306

19.3

−0.7 %

Nyanga

262

12.2

261

11.9

−2.7 %

Plumtree

282

16.0

281

16.0

0.3 %

Rusape

109

18.4

108

18.5

0.9 %

Sadza

316

11.4

316

11.4

0.0 %

Sakubva

326

12.6

326

12.6

0.0 %

Shamva

334

15.6

331

15.4

−1.0 %

Shurugwi

286

12.9

284

12.7

−2.0 %

Silveira

313

9.3

312

9.0

−3.2 %

St Alberts

299

6.7

297

6.7

0.6 %

St Mary’s

599

11.2

599

11.2

0.0 %

Victoria Falls

291

14.1

289

13.8

−1.8 %

Zvishavane

309

15.9

308

15.6

−1.8 %

Total

16,719

12.9 %

16,597

12.5 %

−2.6 %

  1. aAcceptance of PMTCT HIV testing as recorded on the UAT surveillance data collection form
  2. bExcluding those who were known HIV-positive at booking as recorded in the ANC register
  3. cPercent bias is defined as the percent change, positive or negative, from the HIV prevalence among women who did and did not accept PMTCT HIV testing to the HIV prevalence among women who accepted PMTCT HIV testing
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BMC Infectious Diseases

ISSN: 1471-2334

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