Table 3 Logistic regressions for the prevalence of hardcore smoking

Step 1^a

Trend

 2001

1

1

 2012

.665***

(.603, .733)

.658***

(.606, .713)

Step 2^a

Trend

 2001

1

1

 2012

.738***

(.667, .816)

.803***

(.738, .874)

Education

 Low

1

1

 Intermediate

.752***

(.673, .841)

.629***

(.573, .691)

 High

.424***

(.369, .489)

.305***

(.269, .346)

Step 3^b

Trend * Education

 Low vs. Intermediate

.903

(.725, 1.125)

.850

(.709, 1.020)

 Low vs. High

.907

(.686, 1.200)

.656**

(.514, .837)