Positive n = 103

Negative n = 115

X²

p-value

Amecameca

2.29

4.13

43.01

0.0003*

Mexico City

7.34

17.43

Chalco

5.96

7.80

Cuautla

5.50

4.13

Ecatzingo

1.38

0.46

Huehetoca

1.83

0

Ixtapaluca

2.29

5.50

Juchitepec

1.83

0.46

Morelos

3.21

0.46

Ozumba

2.75

0

Ocuituco

5.96

2.75

Texcoco

0.46

2.75

Tlalmanalco

1.38

1.83

Valle de Chalco

0.46

1.83

Xalatlalco

0.92

0

Yecapixtla

1.83

0.46