Table 1 Pearson’s Chi-squared test for Lisbon (LMA) and Porto (PMA) Metropolitan Area.

From: Impact of monthly air pollution and weather conditions on cardiorespiratory mortality in Portuguese Metropolitan Areas

Pearson’s Chi-squared test

LMA

X²

df

p-value

CARDIOxTEMP

97.07

4

0.000

CARDIOxRH

17.90

4

0.001

CARDIOxWS

62.70

4

0.000

CARDIOxPM10

13.47

4

0.009

CARDIOxPM25

18.17

4

0.001

CARDIOxO3

34.00

4

0.000

CARDIOxNO2

24.83

4

0.000

CARDIOxCO

31.03

4

0.000

PMA

CARDIOxTEMP

104.03

4

0.000

CARDIOxRH

0.67

4

0.955

CARDIOxWS

33.90

4

0.000

CARDIOxPM10

13.63

4

0.009

CARDIOxO3

13.73

4

0.008

CARDIOxNO2

16.00

4

0.003

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