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Table 1 Comparison of manual, digital, and conventional parasite density estimations

From: Reliable enumeration of malaria parasites in thick blood films using digital image analysis

Slide

Number of parasites counted per slide

WC

WCC

Parasite density, as parasites/μl

 

Manual counts

Digital counts

  

Manual counts

Digital counts

Conventional counts

BF3A

5022

5071

323

8050

125161

126383

109725

BF5A

4516

4540

162

6400

178410

179358

152178

BF6A

10686

10438

118

5100

461853

451134

271600

BF7A

9373

9515

316

9800

290682

295085

200083

BF8A

344

289

125

2510

6908

5803

5834

BF9A

634

619

202

5020

15756

15383

11359

BF10A

1003

870

353

5400

15343

13309

18638

BF13A

2446

2158

290

9070

76501

67493

50110

BF18A

22477

21956

534

11100

467219

456389

429400

AMI3a

424

438

142

8000

23887

24676

17500

AMI26

127

140

200

8000

5080

5600

3975

AMI32

5819

6149

261

8000

178360

188475

125000

BF7Ab

8059

8251

260

9800

303762

310999

200083

BF8Ab

291

277

109

2510

6701

6379

5834

BF9Ab

369

333

132

5020

14033

12664

11359

BF13Ab

1373

1356

140

9070

88951

87849

50110

BF15A

3904

3914

152

6400

164379

164800

144050

BF16A

14265

14273

162

5100

449083

449335

313062

BF17A

6807

6999

199

9800

335219

344674

238467

AMI3b

281

272

119

8000

18891

18286

17500

Total

98220

97858

  

3226178

3224075

2375867

Mean

  

215

    
  1. Data are kurtosis/skewness (K/Sk) and resultant factor RN, used to set digital particle counting algorithm for each slide; number of particles per slide counted manually and digitally, and compared by absolute % discrepancy, rank correlation, and signed rank test.