Table 2.

Weighted past year and past month drug use by trimester.

Weighted percentages	First trimester 31.53%		Second trimester 36.44%		Third trimester 32.03%
	Past year use	Past month use	Past year use	Past month use	Past year use	Past month use
Licit substances	77.50%	22.50%	91.86%	8.14%	94.23%	5.77%
Tobacco	38.07%	61.93%	49.49%	50.51%	52.50%	47.51%
Alcohol	73.17%	26.83%	90.86%	9.14%	93.84%	6.16%
Illicit substances	85.19%	14.81%	93.42%	6.56%	95.33%	4.67%
Marijuana	56.37%	43.63%	73.99%	26.01%	74.03%	25.97%
Cocaine	77.84%	22.17%	95.74%	4.46%	99.25%	0.75%
Heroin	55.61%	44.40%	78.48%	21.52%	95.98%	4.02%
RX pain meds	77.17%	22.83%	80.20%	19.80%	89.69%	10.31%
Hallucinogens	87.60%	12.40%	94.09%	5.91%	98.16%	1.84%
Tranquilizers	73.55%	26.46%	85.77%	14.23%	92.77%	7.23%
Inhalants	64.77%	35.23%	86.06%	13.94%	52.13%	47.87%
Stimulants	69.66%	30.34%	84.60%	15.40%	91.26%	8.74%
Sedatives	58.46%	41.54%	100%	0.00%	70.76%	29.24%
Polysubstance
1+ Drugs	83.25%	16.75%	91.72%	8.28%	92.18%	7.82%
2+ Drugs	68.30%	31.70%	90.00%	10.00%	92.22%	7.78%
3+ Drugs	68.66%	31.34%	88.97%	11.03%	91.28%	8.72%

Note. Data is cross-sectional; not cohort data. Weighted percentages within each trimester. Past month use is defined by use within the past 30 days.