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. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: Addiction. 2012 Aug 20;107(12):2201–2209. doi: 10.1111/j.1360-0443.2012.03990.x

Table 1.

Covariates and Their Relation to Having Ever Tried Smoking (N=3653)

White (N=2093) Black (N=820) Hispanic (N=482)

% % Smoking 95% CI (%) % % Smoking 95% CI (%) % % Smoking 95% CI (%)
Age Group (Years)
 13 3 15.9 (6.8, 24.9) 1.3 36.4 (7.9, 64.8) 5.8 17.9 (3.7, 32)
 14 18.6 22.1 (18, 26.2) 22.1 24.9 (18.6, 31.2) 20.5 29.3 (20.3, 38.3)
 15 22.5 28.5 (24.4, 32.6) 25 28.8 (22.6, 35) 22 37.7 (28.5, 47)
 16 21.6 38.9 (34.4, 43.3) 25 34.1 (27.7, 40.6) 19.1 39.1 (29.2, 49.1)
 17 20.4 44.4 (39.7, 49.1) 23.7 39.2 (32.3, 46) 20.1 49.5 (39.5, 59.4)
 18 13.9 53.1 (47.4, 58.8) 2.9 50 (30, 70) 12.4 65 (52.9, 77.1)

Sex
 Female 49.6 32.9 (30.1, 35.8) 54.5 30.6 (26.4, 34.9) 48.3 38.6 (32.4, 44.9)
 Male 50.4 38.7 (35.7, 41.6) 45.5 34.6 (29.8, 39.4) 51.7 43 (36.8, 49.1)

Parental Education
 <High School 7.7 55.6 (47.9, 63.2) 12.9 32.1 (23.2, 41) 36.1 39.1 (31.8, 46.3)
 High School 14.7 47.6 (42, 53.1) 18.3 36 (28.3, 43.7) 19.3 41.9 (31.9, 52)
 >High School 75.9 31.5 (29.2, 33.8) 67.7 31.9 (28, 35.8) 41.5 42 (35.2, 48.8)

Household Income ($1000)
 <20 3.2 63.2 (51.8, 74.7) 16.5 38.5 (30.3, 46.7) 19.7 36.8 (27.1, 46.5)
 20–30 4.9 52.9 (43.3, 62.6) 11.3 26.9 (17.9, 35.9) 17.6 41.2 (30.7, 51.6)
 30–50 15.3 43.4 (38, 48.9) 19.1 33.8 (26.4, 41.2) 22.4 37 (27.9, 46.1)
 50–75 20.8 33.7 (29.3, 38.2) 17.6 34.7 (26.9, 42.5) 14.3 47.8 (36, 59.6)
 75–100 19 35.3 (30.6, 40) 13.5 30.6 (22.1, 39.2) 8.3 47.5 (32, 63)
 >100 32.2 29 (25.5, 32.4) 14.8 30.6 (22.4, 38.8) 10.8 46.2 (32.6, 59.7)

Exposure to Smoking Occurrences (Quartiles)
 Lowest 31.4 20.2 (17.2, 23.3) 9.4 28.6 (18.5, 38.7) 22 28.3 (19.7, 36.9)
 2nd 26.3 31.4 (27.5, 35.3) 19.5 26.2 (19.4, 33.1) 27.8 35.1 (27, 43.2)
 3rd 23 44.2 (39.8, 48.6) 31.5 32.2 (26.5, 37.9) 24.3 41.9 (32.9, 50.8)
 Highest 19.3 57.3 (52.5, 62.1) 39.6 36.6 (31.4, 41.9) 25.9 56.8 (48.1, 65.5)

TV Per Day (Hours)
 None 9.1 27.9 (21.5, 34.3) 3.2 30.8 (13, 48.5) 3.7 44.4 (21.5, 67.4)
 <1 28.2 36.9 (33, 40.8) 11.2 30.4 (21, 39.8) 20.7 35 (25.7, 44.3)
 1–2 47.2 35.9 (32.9, 38.9) 35.5 30.6 (25.3, 35.9) 45.9 41.2 (34.7, 47.7)
 3–4 12.7 37.4 (31.5, 43.2) 31.2 31.6 (25.9, 37.3) 22.6 45 (35.6, 54.3)
 4+ 2.8 42.4 (29.8, 55) 18.9 38.7 (31, 46.4) 7.1 41.2 (24.6, 57.7)

TV In Bedroom
 No 43.3 26.8 (23.9, 29.7) 20.2 23.5 (17, 29.9) 30.5 41.5 (33.5, 49.5)
 Yes 56.7 42.7 (39.9, 45.6) 79.8 34.7 (31.1, 38.4) 69.5 40.6 (35.3, 45.9)

Sensation Seeking (Quartiles)
 Lowest 20 15.6 (12.1, 19) 28.2 20.8 (15.5, 26) 20.5 22.2 (14, 30.4)
 2nd 23.1 22.9 (19.2, 26.7) 26.6 26.6 (20.7, 32.5) 24.9 35 (26.5, 43.5)
 3rd 25.5 40 (35.8, 44.1) 25.2 41.1 (34.4, 47.8) 25.9 40 (31.4, 48.6)
 Highest 31.4 54.9 (51.1, 58.7) 20 45.7 (38.1, 53.4) 28.6 60.1 (52, 68.3)

Friends Smoke
 None 42.3 14.4 (12.1, 16.8) 50.6 23.6 (19.5, 27.7) 43.8 21.8 (16.2, 27.4)
 Some 48.8 45.9 (42.9, 49) 42.1 38.6 (33.4, 43.7) 46.5 51.3 (44.8, 57.9)
 Most 8.7 83.6 (78.2, 89) 7.2 59.3 (46.8, 71.9) 9.8 76.6 (64.5, 88.7)

Parental Monitoring (Quartiles)
 Lowest 16.4 56.7 (51.4, 61.9) 17.1 46.4 (38.2, 54.7) 15.4 62.2 (51.1, 73.2)
 2nd 28.3 35.8 (31.9, 39.6) 27.4 30.2 (24.2, 36.2) 24.7 46.2 (37.3, 55.2)
 3rd 17.2 34.1 (29.2, 39) 17.3 28.2 (20.8, 35.6) 18.7 38.9 (28.8, 49)
 Highest 37.7 27.5 (24.4, 30.6) 37.9 29.3 (24.2, 34.3) 41.3 30.7 (24.2, 37.1)

Note: CI = confidence interval.