Table 1 Demographic characteristics.

From: Chronic obstructive pulmonary disease as a risk factor in primary care: a Canadian retrospective cohort study

 

COPD at baseline (n = 4629)

Non-COPD at baseline (n = 128,342)

Test of significance

Age (±SD)

62.8 (11.2)

55.8 (10.9)

t test (p < 0.001)

Female (%)

2405 (52.0)

74,341 (57.9)

Chi2 (p < 0.001)

Urban (%)

4149 (89.6)

114,981 (89.6)

Chi2 (p = 0.008)

Smokers (%)

4175 (90.2)

89,943 (70.1)

Chi2 (p < 0.001)

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