Table 3

Reliability of current smoking assessment tools

 Question Response choices Complete observations Pearson’s r or agreement Which of the following categories best captures the amount of marijuana you smoked over the past 30 days? An eighth of an ounce (which is the same as 3.5 g) 92 Pearson’s r=0.83 A quarter of an ounce (which is the same as 7 g) A half of an ounce (which is the same as 14 g) Three quarters of an ounce (which is the same as 21 g) An ounce (which is the same as 28 g) Grams Ounces Hits Other Refused Don’t know In the last 30 days have you smoked a … Joint 97 Agreement=77.3% Pipe Bong Blunt Spliff In the last 30 days, how many days per week did you smoke a joint? Every day 53 Pearson’s r=0.63 6 days/week 5 days/week 4 days/week 3 days/week 2 days/week 1 days/week Days/month Refused Don’t know On those days, how many joints did you smoke? ___ Number of joints 53 Pearson’s r=0.92 Less than one joint Refused Don’t know In the last 30 days, how many days per week did you smoke a pipe? Every day 55 Pearson’s r=0.77 6 days/week 5 days/week 4 days/week 3 days/week 2 days/week 1 days/week Days/month Refused Don’t know On those days, how many pipes did you smoke? ___ Number of pipes 51 Pearson’s r=0.63 Less than one pipe Refused Don’t know In the last 30 days, how many days per week did you smoke a bong? Every day 9 Pearson’s r=0.76 6 days/week 5 days/week 4 days/week 3 days/week 2 days/week 1 days/week Days/month Refused Don’t know On those days, how many bongs did you smoke? ___ Number of bongs 9 Pearson’s r=0.85 Less than one bong Refused Don’t know Number of days marijuana was smoked in past 30 days* Pearson’s r=0.78* Total number of joints/pipes/bongs used in past 30 days* Pearson’s r=0.89*
• *Calculated based on previous questions.