Accessible Version:  Investigating why humans are susceptible to disease

Map 2 shows an expanded sampling and the results for lactase and lactase nonpersistence within seven geographic regions.

Map 2 showing the geographic location of expanded simulated samples tested for lactase persistence or nonperistence with results

The following table summarizes the percent of people that are lactase persistent or lactase nonpersistent using 300 samples. Like the results for map 1, there are dramatic differences among geographic regions, even regions that are close geographically.

Geographic region

Percent of people that are
lactase persistent

Percent of people that are
lactase nonpersistent
West Africa

16

84
East Africa

56

44
Middle East 1

16

84
Middle East 2

60

40
East Asia

2

98
Northern Europe

80

20
Southern Europe

24

76

Click to view data about these samples by gender.