TABLE 2

Baseline Patient Characteristics by Condition

VariableUC (n = 1365)PPDI (n = 1344)Test ValueP
Age, mean ± SD, y16.85 ± 1.4116.84 ± 1.44t(2686) = 0.32.75
No.13551333
Gender, % (n)
Female, % (n)52.9 (721)55.4 (743)Fisher's exact≤.001
Male, % (n)47.1 (643)44.6 (599)
Ethnicity, % (n)
    White91.2 (1240)91.6 (1224)
    Black2.0 (27)1.5 (20)
    Hispanic2.6 (35)4.0 (54)X52 = 12.18.03
    Asian1.4 (19)1.5 (20)
    Native American0.1 (2)0.1 (1)
    Other2.6 (36)1.3 (17)
School performance
    Much better than average24.7 (336)26.0 (348)
    Better than average39.1 (532)38.6 (517)X32 = 0.71.87
    Average33.4 (455)32.5 (435)
    Below average2.9 (39)3.0 (40)
Smoke occasionally or regularly, % (n)10.6 (145)8.7 (117)Fisher's exact P.10
Smoking experience
    Never smoked69.5 (94)71.4 (961)X42 = 3.44.49
    Smoked but not past year11.4 (156)11.2 (151)
    Smoked past year but not past 30 d8.5 (116)8.6 (116)
    Smoke occasionally now6.4 (87)5.6 (75)
    Smoke regularly now4.2 (58)3.1 (42)
Depression score (CDI)1.45 (2.20) (n = 1327)1.50 (2.19) (n = 1317)t(2642) = 0.58.56
Dad smokes, % (n)15.9 (217)15.4 (207)Fisher's exact.75
Mom smokes, % (n)15.4 (210)17.0 (229)Fisher's exact.25
Sibling smokes, % (n)7.0 (95)6.2 (83)Fisher's exact.44
No. of other smokers in house, % (n)
    070.5 (953)69.6 (931)
    120.7 (280)20.7 (277)
    26.4 (86)7.7 (103)X42 = 3.87.42
    32.4 (32)1.8 (24)
    40.1 (1)0.2 (3)
No. of friends who smoke, % (n)
    None41.3 (563)39.5 (530)
    Only a few36.1 (492)37.3 (500)
    Less than half7.6 (104)8.5 (114)
    About half8.8 (120)7.8 (104)X52 = 3.11.68
    More than half3.7 (50)3.8 (51)
    Almost all2.6 (35)3.1 (42)
Knowledge regarding smoking, mean ± SD0.80 ± 0.560.77 ± 0.56t(2711) = 1.23.22
Confidence to not smoke or stop, mean ± SD9.05 ± 1.959.15 ± 1.82Mann-Whitney z = 1.41.16
Ever told had ADHD, % (n)43.4 (145)56.6 (189)Fisher's exact.009
No. office visits since baseline, % (n)
    None26.3 (352)35.3 (467)
    142.5 (569)36.3 (480)
    218.2 (243)15.3 (202)X52 = 27.50≤.001
    36.9 (92)7.2 (95)
    ≥46.1 (82)6.0 (79)
Think will be smoking year from now, % (n)
    Definitely yes0.1 (1)0.1 (1)
    Probably yes0.3 (4)0.3 (4)X32 = 0.25.97
    Probably not16.3 (198)15.5 (191)
    Definitely not83.3 (1014)84.1 (1034)
Smokers only
    No. days smoked in last 30 days, mean ± SD0.16 ± 0.580.12 ± 0.52Mann-Whitney z = 1.81.07
    Less than 2 days, % (n)25.5 (36)34.2 (40)
    3–5 d, % (n)10.3 (15)5.1 (6)
    6–9 d, % (n)9.7 (14)6.0 (7)
    10–19 d, % (n)16.6 (24)17.1 (20)X52 = 6.40.27
    20–29 d, % (n)10.3 (15)14.5 (17)
    All 30 d, % (n)27.6 (40)23.1 (27)
    No. of cigarettes smoked per day when smoked, % (n)
        Less than 1 a day24.1 (35)21.4 (25)
        1 a day15.9 (23)17.1 (20)
        2–5 a day32.5 (47)38.5 (45)X42 = 1.47.83
        6–20 a day25.5 (37)21.4 (25)
        >20 (half a pack) a day2.1 (3)1.7 (2)
    Estimated No. of cigarettes smoked in last 30 d, mean ± SD (median)121.39 ± 164.93 (50.75)110.30 ± 157.49 (26.25)Mann-Whitney z = 0.54.59
    Last smoked, % (n)
        Today45.5 (66)42.7 (50)X52 = 8.80.12
        1–7 d ago3.8 (49)24.8 (29)
        1–4 wk ago19.3 (28)26.5 (31)
        1–2 mo ago1.4 (2)2.6 (3)
        3–5 mo ago0.0 (0)1.7 (2)
        6–12 mo ago0.0 (0)1.7 (2)
    Fagerstrom, mean ± SD7.33 ± 3.85 (n = 124)6.50 ± 4.01 (n = 103)t(225) = 1.58.12
    HONC, mean ± SD3.86 ± 3.51 (n = 134)3.60 ± 3.32 (n = 113)t(245) = 0.57.56
    Addicted per HONC, % (n)70.9 (95)68.1 (77)Fisher's exact.68
Nonsmokers only
    Try cigarette soon, % (n)
        Definitely yes0.1 (1)0.1 (1)X32 = 0.90.83
        Probably yes1.1 (13)1.2 (15)
        Probably no20.3 (247)21.7 (267)
        Definitely no78.5 (954)77.0 (945)
    If friend offered, smoke, % (n)0.0 (0)X22 = 0.38.83
        Definitely yes0.0 (0)1.1 (14)
        Probably yes1.4 (17)20.5 (251)
        Probably no20.0 (243)78.4 (961)
        Definitely no78.5 (952)
    Susceptible to starting to smoke, % (n)31.7 (385)31.8 (389)Fisher's exact1.00