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Table 1 Study timeline for pre-post evaluation of smoking behaviors and biomarker levels from smoking cigarettes

From: Cigarette ignition propensity, smoking behavior, and toxicant exposure: A natural experiment in Canada

Condition

 

Pre-RIP

 

Switch

 

Post-RIP

 

Visit

1

Field

2

RIP Law Change

3

Field

4

Product

N

N

N

R

R

R

R

Breath CO

X

   

X

  

Saliva Cotinine

X

   

X

  

Urine PAH

Metabolites

X

   

X

  

Topography

 

X

X

  

X

X

  1. N = non-compliant cigarette; R = RIP-compliant cigarette
  2. The timeline represents the treatments given to participants on each day of the study; Ontario, Canada, 2005-06.