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Table 2 Descriptive statistics for characteristics of ALL incidence and H. pylori prevalence studies/countries

From: The association between Acute Lymphoblastic Leukemia in children and Helicobacter pylori as the marker for sanitation

ALL incidence rate (per 100,000 persons)

Mean

Median

s.d.b

Frequency

(%)

Weighted ALL incidence a (28 countries)

17.61

16.40

11.75

-

-

Non-weighted ALL incidence rate (127 cancer registries)

21.68

21.25

12.62

-

-

Characteristics of included countries (n = 28)

     

Gross National Product per capita for countries (USD$)

11375.79

9520.00

1182.10

-

-

Human Development Index for countries

0.80

0.87

0.14

-

-

Population size for countries

118137528

36416282

265588002

-

-

Characteristics of H. pylori studies (n = 28)

     

H. pylori prevalence (%)

26.56

19.30

21.46

-

-

Minimum age of children (years)

2.21

1.50

2.25

-

-

Maximum age of children (years)

6.21

5.00

2.43

-

-

Interval between ALL incidence and H. pylori surveys (years)

4.11

3.00

4.78

-

-

Method of H. pylori detection

     

 Serological assays using IgG

-

-

-

25

89.29

 Urea breath test

-

-

-

3

10.71

Population source

     

 Community-based

-

-

-

10

35.71

 Clinic-based

-

-

-

18

64.29

Level of urbanization

     

 Rural

-

-

-

4

14.29

 Urban

-

-

-

16

57.14

 Both rural and urban

-

-

-

8

28.57

Region

     

 Africa

-

-

-

2

7.14

 Americas

-

-

-

4

14.29

 Southeast Asia

-

-

-

2

7.14

 Europe

-

-

-

14

50.00

 Western Pacific

-

-

-

6

21.43

  1. a Weighted ALL incidence rate for each country was obtained using the inverse variance method.
  2. b Standard deviation.