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Table 2 Results of logistic regression analysis investigating the effect of age, gender and HbS genotype on malaria status as determined by microscopya using combined data.

From: Genetic determinants of anti-malarial acquired immunity in a large multi-centre study

Factor

Adjusted OR (95 % CI)

p-value

Malaria status by microscopy

Individuals positive (total = 1,966)

Individuals negative (total = 7,261)

N

(%)

N

(%)

Age (years)

 <1

1

 

37

(10.9)

303

(89.1)

 1–2

1.33 (0.87–2.05)

0.191

47

(17.2)

225

(82.7)

 2–5

2.65 (1.88–3.72)

<0.001

311

(26.7)

854

(73.3)

 5–15

3.49 (2.53–4.86)

<0.001

1,141

(25.6)

3,314

(74.4)

 15–30

1.21 (0.87–1.70)

0.263

281

(17.1)

1,365

(82.9)

 >30

0.63 (0.44–0.90)

0.010

147

(11.1)

1,177

(88.9)

Gender

 Female

1

 

1,044

(20.1)

4,142

(79.9)

 Male

1.09 (0.98–1.21)

0.109

922

(22.8)

3,119

(77.2)

HbS

 11

1

 

1,824

(21.4)

6,718

(78.6)

 12

0.75 (0.61–0.92)

0.005

136

(21.1)

508

(78.9)

 22

ND

ND

0

(0)

8

(100)

  1. Data from Senegal, Mali (Pongonon), Sudan and Sri Lanka are not included as participants are either entirely microscopically malaria-positive or malaria-negative.
  2. Reference category is “negative” (n = 7261).
  3. Results significant at 0.05 level are highlighted in italics.
  4. ND: Results not shown as unable to obtain estimates for HbSS without any infected individuals.
  5. NB: CI confidence interval, OR odds ratio.
  6. aAlso adjusted for altitude, village (>20), ethnicity (>20), sample month (>20) and study; results not shown.