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Table 3 Treatment effect on four transmission outcomes:

From: Reduction of transmission from malaria patients by artemisinin combination therapies: a pooled analysis of six randomized trials

Patient-level outcomes (gametocytaemia)

Variable

N patients

Univariate AUC

Ratio

of arithmetic

means (95% CI)

P value

N patients

Univariate OR slide-

positive gametocytaemia on

day of feeding

(95% CI)

P value

Antimalarial

      

CQ (non-artemisinin)

240

1

<0.00

337

1

<0.00

SP (non-artemisinin)

325

1.56 (1.27–1.93)

1

520

3.11 (2.19–4.40)

1

CQ-SP (non-artemisinin)

198

1.03 (0.81–1.32)

 

227

1.33 (0.86–2.06)

 

CQ-AS (ACT)

291

0.72 (0.57–0.91)

 

344

0.42 (0.28–0.62)

 

SP-AS3 (ACT)

187

0.62 (0.47–0.83)

 

581

0.50 (0.32–0.78)

 

AL (Coartem) (ACT)

407

0.18 (0.13–0.25)

 

404

0.15 (0.08–0.29)

 

ACT

      

non-artemisinin

872

1

<0.00

1201

1

<0.00

ACT

885

0.35 (0.31–0.41)

1

1329

0.20 (0.16–0.26)

1

ACT by pre-treatment gametocytaemia

      

day 0 slide-negative

 

†

  

†

 

non-artemisinin

727

1

<0.00

994

1

<0.00

ACT

745

0.23 (0.19–0.28)

1

1125

0.13 (0.10–0.17)

1

day 0 slide-positive

      

non-artemisinin

145

1

0.054

164

1

 

ACT

140

0.80 (0.64–1.00)

 

183

0.41 (0.25–0.67)

<0.00

ACT by parasitological treatment failure

      

No failure

 

†

    

non-artemisinin

459

1

<0.00

468

1

<0.00

ACT

605

0.31 (0.25–0.37)

 

615

0.28 (0.20–0.38)

1

Failure

    

1

 

non-artemisinin

269

1

<0.00

303

 

<0.00

ACT

218

0.51 (0.40–0.65)

1

233

0.33 (0.22–0.49)

1

Mosquito-level outcomes

Variable

N mosquito es

Adjusted OR mosquito infection (95% CI)*

P value

N mosquito es

Adjusted OR oocyst count per midgut in highest 50% of positive counts (4) (95% CI)*

P value

Antimalarial

      

CQ (non-artemisinin)

2194

1

0.002

2194

1

<0.00

SP (non-artemisinin)

6762

0.42 (0.20–0.87)

 

4079

0.25 (0.09–0.75)

1

CQ-SP (non-artemisinin)

1277

1.28 (0.43–3.85)

 

1146

0.12 (0.03–0.58)

 

CQ-AS (ACT)

974

0.28 (0.11–0.71)

 

974

0.25 (0.05–1.21)

 

SP-AS3 (ACT)

2793

0.29 (0.12–0.69)

 

1439

0.39 (0.09–1.8)

 

AL (Coartem) (ACT)

2299

0.22 (0.08–0.61)

 

292

- ‡

 

ACT

      

non-artemisinin

11653

1

0.029

7419

1

0.165

ACT

6066

0.49 (0.33–0.73)

 

2705

0.45 (0.14–1.39)

 

ACT by pre-treatment gametocytaemia

      

day 0 slide-negative

      

non-artemisinin

8811

1

0.002

5700

1

0.008

ACT

4039

0.49 (0.31–0.77)

 

1419

0.11 (0.02–0.56)

 

day 0 slide-positive

      

non-artemisinin

2277

1

<0.00

1326

1

0.102

ACT

1870

0.30 (0.16–0.55)

1

1129

0.28 (0.06–1.29)

 

ACT by parasitological treatment failure

      

No failure

      

non-artemisinin

4773

1

0.003

2037

1

0.486

ACT

3496

0.46 (0.28–0.76)

 

740

0.49 (0.07–3.62)

 

Failure

      

non-artemisinin

3027

1

0.021

1574

1

0.294

ACT

897

0.37 (0.16–0.86)

 

572

0.33 (0.04–2.59)

 
  1. at the patient level, the area under the curve of gametocyte density (microscopy measurement) during follow up (28 days), the presence of slide-positive gametocytaemia on the day of feeding; at the mosquito level, the presence of infection in mosquitoes, and high density infection in mosquitoes.
  2. * adjusted for type of serum (autologous/control) used in transmission experiment
  3. † P interaction with ACT/non-artemisinin <0.05
  4. ‡ Mosquitoes were infected only in study 6 where oocyst data was not collected, except one mosquito in study 5 which had a missing oocyst count.