Skip to main content

Table 2 Percent completing M6 and probability of retention at M3 and M6 by baseline prescription drug use and quality of life (QOL) in 1011 participants

From: The impact of non-medical cannabis legalization and other exposures on retention in longitudinal cannabis research: a survival analysis of a prospective study of Canadian medical cannabis patients

Baseline prescription drug use and QOL

Completed M6 (%)

Kaplan–Meier estimator

Probability of remaining in study

M3

M6

P

Use of opioid

   

0.004

  No

306/697 (43.9)

0.74

0.44

 

  Yes

102/290 (35.2)

0.66

0.35

 

Opioid – defined daily dose (DDD)

   

0.321

  < 0.57

44/108 (40.7)

0.64

0.41

 

  ≥ 0.57

34/108 (31.5)

0.66

0.31

 

Use of non-opioid pain medications

   

0.721

  No

314/770 (40.8)

0.73

0.41

 

  Yes

94/215 (43.7)

0.70

0.44

 

Non-opioid pain medications—defined daily dose (DDD)

   

0.245

  < 0.43

37/76 (48.7)

0.72

0.49

 

  ≥ 0.43

36/89 (40.4)

0.64

0.40

 

Use of benzodiazepine

   

0.151

  No

375/918 (40.8)

0.71

0.41

 

  Yes

32/67 (47.8)

0.82

0.48

 

Benzodiazepine–defined daily dose (DDD)

   

0.151

  < 0.38

13/29 (44.8)

0.71

0.41

 

  ≥ 0.38

15/27 (55.6)

0.82

0.48

 

Use of antidepressant

   

0.011

  No

324/818 (39.6)

0.71

0.40

 

  Yes

83/166 (50.0)

0.78

0.50

 

Antidepressant—defined daily dose (DDD)

   

0.342

  < 1

14/35 (40.0)

0.74

0.40

 

  ≥ 1

45/90 (50.0)

0.78

0.50

 

Use of anti-seizure

   

0.003

  No

326/827 (39.4)

0.71

0.39

 

  Yes

83/159 (52.2)

0.79

0.52

 

Anti-seizure—defined daily dose (DDD)

   

0.542

  < 0.5

24/46 (52.2)

0.80

0.52

 

  ≥ 0.5

34/72 (47.2)

0.75

0.47

 

WHOQOL—physical health (baseline)

   

0.671

  < 36

218/526 (41.4)

0.74

0.41

 

   ≥ 36

199/481 (41.4)

0.70

0.41

 

WHOQOL—psychological (baseline)

   

0.042

  < 54

166/442 (37.6)

0.71

0.38

 

   ≥ 54

251/565 (44.4)

0.73

0.44

 

WHOQOL—social relationships (baseline)

   

0.168

  < 58

147/384 (38.3)

0.71

0.38

 

  ≥ 58

270/623 (43.3)

0.72

0.43

 

WHOQOL—environment (baseline)

   

0.166

   < 66

222/556 (39.9)

0.70

0.40

 

  ≥ 66

195/451 (43.2)

0.75

0.43

 
  1. M3 = month 3 timepoint, M6 = month 6 timepoint