Table 2 Results of two-sample and multi-sample statistical comparisons of An. stephensi survival times.

1

100

400

2,000

(August 2007)

0

Hazard Ratio (HR)

1.1413

1.4261

2.2004

HR C.I.

(0.87, 1.50)

(1.17, 1.74)

(1.77, 2.74)

Mantel-Cox

0.9124

12.4278

52.6238

P-value

0.3395

0.0004*

<0.0001*

100

HR

1.4003

1.9702

HR C.I.

(1.09, 1.80)

(1.52, 2.55)

Mantel-Cox

6.9297

27.2606

P-value

0.0085*

<0.0001*

400

HR

1.4023

HR C.I.

(1.16, 1.70)

Mantel-Cox

12.2886

P-value

0.0005*

All 4 Groups

Log-rank

55.89

P-value

<0.0001*

2

100

400

2,000

(April 2008)

0

HR

0.7312

1.1786

1.7447

HR C.I.

(0.58, 0.92)

(0.97, 1.44)

(1.38, 2.20)

Mantel-Cox

7.0017

2.6747

22.3554

P-value

0.0081*

0.1020

<0.0001*

100

HR

1.6063

2.1607

HR C.I.

(1.27, 2.03)

(1.65, 2.82)

Mantel-Cox

15.7261

33.6528

P-value

<0.0001*

<0.0001*

400

HR

1.3186

HR C.I.

(1.05, 1.66)

Mantel-Cox

5.6392

P-value

0.0176*

All 4 Groups

Log-rank

31.20

P-value

<0.0001*

3

50

250

1,000

(July 2008)

0

HR

2.2198

2.1914

2.5451

HR C.I.

(1.77, 2.79)

(1.76, 2.73)

(2.06, 3.15)

Mantel-Cox

49.5610

51.1026

78.9376

P-value

<0.0001*

<0.0001*

<0.0001*

50

HR

1.0144

1.1677

HR C.I.

(0.86, 1.20)

(0.99, 1.37)

Mantel-Cox

0.0283

3.7481

P-value

0.8664

0.0529

250

HR

1.1543

HR C.I.

(0.99, 1.34)

Mantel-Cox

3.5264

P-value

0.0604

All 4 Groups

Log-rank

36.61

P-value

<0.0001*