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Table 1 Demographic and environmental features of the study population stratified by Plasmodium falciparum PCR status and by transmission intensity

From: Evaluating malaria prevalence and land cover across varying transmission intensity in Tanzania using a cross-sectional survey of school-aged children

 

Overall

Transmission intensity

Low

Moderate

High

P.f. neg

P.f. pos

P.f. neg

P.f. pos

P.f. neg

P.f. pos

Individual level

n

17,131

6,076

69

1,829

351

5,938

2,868

Age (years)

11 [9, 13]

11 [9, 12]

12 [10, 14]

11 [9, 13]

12 [10, 14]

11 [9, 13]

12 [10, 13]

Male (%)

8,457 (49)

3,020 (50)

33 (48)

895 (49)

190 (54)

2,761 (46)

1,558 (54)

School level

n

182

41

20

5

23

2

91

Per cent cropland

14 [3, 32]

3 [1, 14]

9 [3, 15]

39 [28, 39]

16 [7, 44]

47 [44, 50]

23 [9, 40]

Per cent forest

16 [5, 36]

33 [9, 43]

23 [11, 41]

3 [1, 22]

11 [3, 18]

12 [7, 18]

11 [3, 26]

Per cent grassland

49 [27, 68]

54 [45, 66]

51 [36, 60]

15 [9, 36]

40 [18, 78]

21 [21, 22]

46 [23, 68]

Per cent flooded/ swamp

0 [0, 5]

0 [0, 1]

0 [0, 5]

37 [6, 42]

1 [0, 25]

8 [4, 11]

0 [0, 9]

Per cent other land covera

0 [0, 1]

0 [0, 3]

0 [0, 1]

0 [0, 3]

0 [0, 0]

12 [6, 18]

0 [0, 0]

Temperature (> 16 °C)

16 [11, 19]

13 [9, 18]

14 [10, 17]

13 [13, 14]

15 [11, 19]

17 [17]

18 [14, 19]

Precipitation

1 [1, 2]

1 [1, 2]

1 [1]

2 [1, 2]

1 [1]

3 [2, 3]

2 [1, 3]

Vegetation

0.22 [0.18, 0.31]

0.21 [0.17, 0.28]

0.22 [0.18, 0.27]

0.13 [0.12, 0.25]

0.20 [0.15, 0.40]

0.26 [0.23, 0.29]

0.25 [0.19, 0.32]

Elevation (m)

1208 [973, 1443]

1505 [1282, 1650]

1460 [1169, 1619]

1133 [553, 1177]

1058 [544, 1344]

1228 [1212, 1244]

1177 [533, 1339]

Population density (per sq km)

102 [55, 209]

147 [52, 502]

95 [64, 290]

114 [90, 838]

72 [48, 202]

317 [177, 456]

104 [63, 170]

Proximity to water (km)

3 [2, 6]

3 [2, 6]

3 [1, 7]

1 [1, 2]

3 [1, 4]

6 [4, 7]

4 [2, 6]

  1. Data are n (%), or median, [IQR]. P.f.: Plasmodium falciparum. Land cover percentages are presented as median values for each stratum and are not expected to sum to 100%
  2. a Other land cover classes include urban and bare