Table 2.

Trends in prevalence (%) of past 12-month cannabis use across gender by age groups, 2014–2016 Washington state general population (N = 5429)

	WOMEN								MEN
	50–64				≥65				50–64				≥65
	2014	2015	2016	P	2014	2015	2016	P	2014	2015	2016	P	2014	2015	2016	P
Never used cannabis in the past 12 months (%)	84.2	71.3	75.1	0.01	93.1	93.4	88.2	0.07	76.8	71.9	62.4	0.04	85.3	86.7	81.8	0.59
Frequency among past 12-month cannabis users (%)
Infrequent^a	18.2	35.7	23.2	0.08	51.9	47.9	43.3	0.98	25.5	15.8	21.6	0.76	32.8	2.3	30.6	0.20
Regular	31.8	31.7	50.3		30.6	35.1	38.1		34.1	47.4	38.0		26.7	48.8	31.4
Daily/near daily	50.0	32.6	26.5		17.5	17.0	18.6		40.4	36.8	40.3		40.5	48.9	38.0
Most common route of administration (%)
Smoke only	78.8	61.8	58.7	0.52	67.6	59.5	53.8	0.52	92.9	75.7	74.5	0.31	56.2	43.2	66.7	0.86
Vaporize	7.9	9.6	8.8		3.6	6.2	18.0		3.4	6.8	7.3		10.3	16.8	12.0
Oral	11.3	19.0	20.5		28.8	27.9	23.3		3.7	16.0	14.7		24.0	27.6	15.2
Other	2.0	9.5	12.0		0.0	6.4	4.9		0.0	1.6	3.5		9.5	12.4	6.1
Co-use with alcohol (%)
Cannabis only/no alcohol	22.8	13.7	36.9	0.01	12.2	19.2	10.5	0.42	24.9	20.8	22.5	0.50	32.0	26.4	20.5	0.50
Always uses separately	27.9	53.2	23.7		66.5	36.3	52.6		36.7	20.2	26.0		30.0	46.4	25.5
Usually/always	49.3	33.2	39.4		21.3	44.5	36.9		38.5	59.0	51.4		38.1	27.2	54.0

^aInfrequent = < monthly; regular = monthly, > monthly/< weekly, weekly; daily/near daily = daily

Bold indicates P for trend < 0.05