TABLE 4.
Patterns and attitudes regarding marijuana use among past-year users
| Characteristic | Pregnant % (95% CI) (n = 785) | Nonpregnant % (95% CI) (n = 17,149) |
|---|---|---|
| PATTERNS OF USE | ||
| Meet DSM-IV criteria for marijuana abuse or dependencea | ||
| Yes | 18.1 (14.0–23.1) | 11.4 (10.7–12.1) |
| No | 81.9 (77.0–86.0) | 88.6 (87.9–89.3) |
| Age of initiation of marijuana use, ya | ||
| 14 or younger | 36.0 (30.7–41.7) | 27.0 (25.9–28.1) |
| 15–17 | 37.3 (32.6–42.2) | 41.5 (40.1–42.8) |
| 18 or older | 26.7 (22.0–32.0) | 31.6 (30.3–32.9) |
| Frequency of marijuana use in past 12 mos, da,b | ||
| 1–11 | 24.2 (21.1–27.6) | 38.9 (37.7–40.2) |
| 12–49 | 19.6 (15.6–24.3) | 19.1 (18.3–20.0) |
| 50–99 | 8.7 (5.9–12.5) | 9.1 (8.4–9.9) |
| 100–299 | 31.4 (26.3–36.9) | 20.1 (19.1–21.1) |
| ≥300 | 16.2 (12.3–21.1) | 12.8 (11.9–13.6) |
| Method of obtaining last used marijuanaa | ||
| Bought | 43.8 (38.5–49.2) | 33.0 (31.9–34.1) |
| Received for free/shared | 51.6 (46.1–57.1) | 63.1 (62.1–64.2) |
| Traded/grew it | 0.7 (0.3–1.7) | 1.4 (1.1–1.8) |
| Method unspecified | 3.9 (1.6–9.2) | 2.5 (2.1–3.0) |
| Source of last marijuana boughtb | ||
| Friend | 78.2 (68.7–85.5) | 77.5 (74.6–80.2) |
| Relative | 10.6 (5.3–20.3) | 5.6 (4.2–7.5) |
| Someone just met/did not know | 7.1 (3.6–13.4) | 13.1 (11.0–15.5) |
| Source unspecified | 4.1 (1.2–12.9) | 3.8 (2.6–5.4) |
| ATTITUDES TOWARD MARIJUANA USE | ||
| Difficulty in acquiring marijuanab | ||
| Impossible or very difficult | 4.0 (1.9–8.0) | 2.5 (2.1–3.0) |
| Fairly difficult | 4.3 (2.4–7.6) | 5.8 (5.2–6.4) |
| Fairly or very easy | 91.7 (88.4–84.2) | 91.7 (90.9–92.5) |
| Perceived risk of marijuana use once a monthb | ||
| Great risk | 8.6 (6.0–12.1) | 5.8 (5.2–6.4) |
| Moderate risk | 12.8 (10.0–16.4) | 12.7 (11.8–13.7) |
| Slight risk | 41.5 (36.0–47.2) | 40.3 (39.0–41.6) |
| No risk | 37.2 (32.1–42.5) | 41.2 (39.9–42.5) |
| Perceived risk of marijuana use once or twice a weekb | ||
| Great risk | 8.4 (6.0–11.7) | 9.3 (8.4–10.2) |
| Moderate risk | 21.1 (16.9–25.9) | 21.1 (20.2–22.1) |
| Slight risk | 38.9 (33.2–44.9) | 39.3 (38.1–40.6) |
| No risk | 31.6 (26.8–36.9) | 30.3 (29.1–31.5) |
National Survey of Drug Use and Health, 2007–2012 (n = 17,934).
CI, confidence interval.
a
χ2 P < .05 for differential distribution of variable by pregnancy status;
b
Because of small cell sizes, “do not know” responses were coded as missing (n = 551 for frequency; n = 54 for difficulty; n = 34 for risk in month; n = 54 for risk in a week).
Ko. Prevalence and patterns of marijuana use. Am J Obstet Gynecol 2015.