Table 6.

The analgesic efficacy of medical cannabis therapy at 1, 3, and 12 months

	Prior MC	With MC	P	Prior MC	With MC	P	Prior MC	With MC	P
NRS	1 month, 30 patients			3 months, 18 patients			12 months, 12 patients
Median	8	6	<0.01	8	4	<0.01	8.5	4	<0.01
IQR	1.25	3.25		2	2.25		2	2.75
Mean	8	6		8	4		8.5	4
± SD	1.4	2.3		1	1.8		1.2	2.1

MC medical cannabis, IQR interquartile range, ± plus/minus, SD standard deviation. The analgesic efficacy was measured with numerical rating scale (NRS) in 38 patients with fibromyalgia syndrome treated with medical cannabis at an Italian pain clinic. Wilcoxon signed-rank test was used to evaluate differences between time points