Table 4.

Specific effects and robustness checks results from across all 21 papers included in the systematic review.

	Paper [reference number]	Pre–post MML change within MML states
		Overall finding
		+ (increase, P < 0.05) or – (decrease, P < 0.05) or NS (P > 0.05)
MML provisions and individual state laws
Individual states
Montana	95; 95; 95; 95; 95; 95; 52	NS, NS, NS, NS, NS, NS, −
Rhode Island	95; 95; 95; 52	NS, NS, NS, NS
Michigan	95	NS
Colorado	88	NS
Maine	52	NS
Nevada	52	–
Vermont	52	NS
Law variations
Requirement for patient registries	70; 70; 69; 46; 73	NS, NS, NS, +, +a
Registration rates	51	+b
Allowance for dispensaries	70; 70; 46; 73; 73; 73; 73; 63; 69	NS, NS, NS, NS, NSc, NSd, NSe, NS, +
Number of patients allowed per care‐giver	73; 73	NS, NSf
Allowance for home cultivation	70; 73; 69; 95; 73; 46; 70	NS, NS, NS, NSg, NSh, −, −
Number usable ounces allowed	73; 73	NSi, +
Generic ‘chronic pain’ as eligible condition	69	NS
MML provision index score	73	–
Senate/ballot‐passed	96; 96	NSj, NSk
Subgroups
Grade
8th	63; 64	–, −
9th and higher	52; 63; 64; 52; 52; 63; 64; 52	NSl, NSm, NSm, NSm, NSn, NSo, NSo, NSo
Age group	53; 53	NSp, NSq
Perceived risk	64; 87)	–r, NSs
Gender	53; 53	NSt, NSu

A test of the same specific effect from the same study is listed more than once if tests are formulated differently (e.g. different years data used or comparison group). MML = medical marijuana law; NS = not significant.

^a‘voluntary registration’ [Maine];

^bper‐capita registration rate;

^c‘active’ dispensaries;

^d‘for‐profit’ dispensaries;

^edispensary index score;

^f≥ 5 patients allowed per care‐giver;

^glimit (yes/no) for no. of plants allowed for home cultivation;

^h≥ 10 plants allowed for home cultivation;

ⁱusable amount is limited to 2.5 ounces (yes/no);

^jballot‐passed;

^ksenate‐passed;

^l9th grade;

^m10th grade;

ⁿ11th grade;

^o12th grade;

^p<17 years old;

^q≥17 years old;

^rperceives great or moderate risk of harm in occasional marijuana use;

^sperceives no or slight risk of harm in occasional marijuana use;

^tmales;

^ufemales.