Table 5

Univariate analysis-presence of gametocytes after enrolment up to day 14


% (N) with gametocytes
OR [95%]
P-value



All
(N = 6793)
Thailand
(N = 5069)
The Gambia
(N = 1110)
Tanzania
(N = 614)

Total1
15 (998)
7 (342)
36 (400)
42 (256)

< 0.0012




Age (years)3




     0–5
28 (530)
13 (118)
40 (249)
41(163)
     5–15
16 (432)
10 (202)
33 (159)
56 (62)
     > 15
13 (293)
12 (251)
75 (3)
40 (39)

0.985 [0.979–0.992]
0.987 [0.979–0.995]
0.963 [0.918–1.011]
0.978 [0.963–0.993]

< 0.001
0.001
0.131
0.005

Symptoms




     Yes
14 (546)
10 (364)
No Data
51 (182)
     No
25 (42)
9 (10)

57 (32)

0.936 [0.586–1.486]
1.147 [0.580–2.268]

0.0.784 [0.444–1.387]

0.784
0.694

0.403

History of illness




     > = 3 days
30 (193)
25 (129)
No Data
48 (64)
     < 3 days
12 (408)
8 (234)

57 (174)

2.030 [1.658–2.484]5
3.400 [2.640–4.380]

0.683 [0.453–1.029]

< 0.001
< 0.001

0.067

Sex




     Male
18 (446)
10 (203)
39 (136)
57 (107)
     Female
19 (421)
10 (172)
37 (117)
52 (132)

1.071 [0.910–1.261]
1.041 [0.836–1.295]
1.052 [0.766–1.445]
1.201 [0.821–1.758]

0.406
0.722
0.754
0.345

Severe Anaemia




     Yes
33 (18)
29 (7)
37 (11)
No Data
     No
17 (636)
10 (287)
34 (341)


1.536 [0.858–2.747]5
2.433 [0.989–5.986]5
1.302 [0.586–2.893]


0.145
0.045
0.515


Anaemia




     Yes
32 (294)
26 (136)
38 (157)
No Data
     No
12 (360)
7 (158)
32 (195)


2.308 [1.920–2.775]5
4.135 [3.156–5.418]
1.402 [1.069–1.840]


< 0.001
< 0.001
0.014


Haematocrit3
0.917 [0.903–0.932]5
0.872 [0.853–0.891]
0.974 [0.950–0.998]
No Data

< 0.001
< 0.001
0.037


Palpable liver




     Yes
21 (156)
17 (100)
40 (56)
No Data
     No
13 (449)
9 (256)
37 (193)


1.725 [1.378–2.162]
1.965 [1.513–2.551]
1.216 [0.772–1.918]


< 0.001
< 0.001
0.398


Palpable spleen




     Yes
22 (253)
17 (143)
40 (110)
No Data
     No
11 (355)
8 (212)
36 (143)


1.708 [1.412–2.065]5
2.227 [1.756–2.826]5
1.067 [0.768–1.483]


< 0.001
< 0.001
0.698


Temperature




     > = 37 C
14 (385)
9 (213)
40 (172)
No Data
     < 37.5 C
15 (242)
11 (161)
33 (81)


0.947 [0.785–1.141]
0.831 [0.664–1.040]
1.273 [0.904–1.794]


0.564
0.106
0.165


Parasitaemia3,4(/μL)




     ≤ 1,600
13 (187)
9(110)
25 (16)
46 (61)
     1,600–4,000
20 (205)
10(76)
30 (28)
57 (101)
     4,000 – 20,000
18 (355)
12(185)
34 (100)
55 (70)
     > 20,000
21 (502)
13 (200)
41 (267)
20 (35)

1.120 [1.013–1.238]
1.053 [0.936–1.184]
1.335 [1.907–1.625]
1.182 [0.960–1.458]

0.027
0.394
0.004
0.115

Mixed infection




     Yes

4 (22)


     No
No Data
12 (549)
No Data
No Data


0.366 [0.236–0.567]5




< 0.001



Treatment6




     A
10 (413)
8 (287)
16 (106)
10 (11)
     C-F
26 (516)
18 (276)
27 (13)
49 (227)

3.073 [2.384–3.962]
3.063 [2.330–4.026]
3.259 [1.028–10.387]
4.751 [1.530–14.754]

< 0.001
< 0.001
0.033
0.003
     G-H
70 (301)
No Data
71 (283)
62 (18)7

11.744 [8.019–17.199]

11.936 [8.136–17.510]


< 0.001

< 0.001


1 Percentages are calculated from patients with both non-missing counts on day 7 and day 14 (out of 4840, 1099 and 603 patients, respectively)

2 p-value from chi-square test

3 OR and test for the continuous representation

4 The Gambia, Thailand: OR calculated for log10 parasitaemia; Tanzania, All : OR for ordered categories, p-value is for test for trend.

5 p-value for homogeneity < 0.05

6 treatments groups are defined as: A: artemisisnin combination alone or with other treatments; C-F: other monotherapies (see Table 1); G-H: SP alone or SP with chloroquine. OR are calculated with reference to group A.

7 G-H/A at separate sites

Stepniewska et al. Malaria Journal 2008 7:249   doi:10.1186/1475-2875-7-249

Open Data