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. 2019 Feb 25;9:2712. doi: 10.1038/s41598-019-39462-1

Table 2.

Effects of Product Characteristics on Symptom Relief.

Outcome = Symptom Change (Ending - Starting Symptom)
(1) (2) (3) (4) (5)
Panel A: Product Type, omitted category = flower
Concentrate 0.194** 0.080
(0.076) (0.212)
Edible 0.340***
(0.105)
Tincture 0.498***
(0.117)
Topical −0.216
(0.355)
Panel B: Subspecies, omitted category = hybrid
C. indica −0.103** −0.057
(0.041) (0.083)
C. sativa 0.096* 0.195
(0.055) (0.121)
Panel C: Combustion Method, omitted category = joint
Pipe −0.061 −0.004
(0.084) (0.194)
Vape 0.051 0.051
(0.092) (0.210)
Panel D: THC and CBD, omitted categories = THC < 10% and CBD < 1%
THC 10–19% −0.215* −0.220*
(0.117) (0.134)
THC 20–34% −0.235** −0.315***
(0.112) (0.121)
THC 35%+ −0.252** −0.342**
(0.126) (0.166)
CBD 1–9% −0.089 −0.026
(0.121) (0.126)
CBD 10–34% 0.038 0.079
(0.105) (0.092)
CBD 35%+ −0.222 −0.241
(0.209) (0.227)
Starting Symptom Level −0.704*** −0.721*** −0.726*** −0.709*** −0.717***
(0.028) (0.031) (0.032) (0.056) (0.063)
Constant 0.588*** 0.691*** 0.719*** 0.909*** 0.850**
(0.165) (0.184) (0.212) (0.340) (0.403)
Number of sessions 19,910 17,197 16,898 4,439 3,869
R-squared 0.330 0.340 0.338 0.337 0.346
Number of users 3,341 2,996 2,936 900 787

Notes: Regressions control for individual user fixed effects. Concentrate is relative to Flower, C. indica and C. sativa are relative to Hybrid, THC categories are relative to THC 0–9%, CBD categories are relative to CBD 0%, and Pipe and Vape are relative to Joint. Standard errors are clustered at the user level (shown in parentheses). ***p < 0.01, **p < 0.05, *p < 0.1.