Urban

Rural

p-value

All children

n = 2100 (U)

n = 490 (U1)

n = 207 (R1)

U1 vs R1

Allergens

n (%)

n (%)

n (%)

Dermatophagoides pteronyssinus

198 (9.4)

138 (28.1)

60 (28.9)

0.00001

Blomia tropicalis

109 (5.1)

78 (15.9)

31 (14.9)

0.00001

Cockroach

87 (4.1)

59 (12)

28 (13.5)

0.00001

Cat dander

29 (1,3)

18 (3.6)

11 (5.3)

0.04

Dog dander

24 (1.1)

15 (3)

9 (4.3)

0.001

Grass pollen mix

45 (2.1)

33 (6.7)

12 (5.7)

0.003

Aspergillus fumigatus

21 (1)

16 (3.2)

5 (2.4) 0

0.0004

Alternaria alternata

15 (0.8)

12 (2.4)

3 (1.4)

0.01

Peanuts

72 (3.5)

53 (10.8)

19 (9.1)

0.00001

Eggs

65 (3.1)

44 (8.9)

21 (10.1)

0.00001

Shrimp

32 (1.6)

24 (4.8)

8 (3.8)

0.01