TABLE 2.

Association Between Baseline Characteristics and Becoming an Established Smoker by Wave 3

Baseline Characteristics (N = 1791)	Established Smokers by Wave 3 (N = 235; 13.1%)		Minimally Adjusted RR (95% CI)a	Fully Adjusted RR (95% CI)b
	n	Row%
Movie smoking exposurec
First quartile	502	6.6	1.00	1.00
Second quartile	472	10.8	1.54 (1.07–2.21)d	1.36 (0.95–1.94)
Third quartile	431	15.6	2.17 (1.54–3.05)e	1.68 (1.15–2.44)f
Fourth quartile	386	21.8	2.88 (2.08–3.98)e,g,h	1.98 (1.35–2.90)e
Sociodemographics
Age, y
10–11	593	8.8	1.00	1.00
12	561	14.6	1.68 (1.19–2.37)	1.56 (1.17–2.08)
13–14	637	15.9	1.80 (1.34–2.42)	1.40 (1.08–1.83)
Gender
Male	821	15.8	1.00	1.00
Female	970	10.8	0.68 (0.61–0.77)	0.86 (0.74–1.00)
Social influences
Either parent smokes
No	1335	10.8	1.00	1.00
Yes	456	20.0	1.91 (1.58–2.31)	1.36 (1.05–1.76)
Any friends smoke
No	1393	10.3	1.00	1.00
Yes	398	23.1	2.14 (1.63–2.80)	1.51 (1.06–2.16)
Any siblings smoke
No	1639	12.0	1.00	1.00
Yes	152	25.7	2.12 (1.50–2.98)	1.27 (0.90–1.78)
Receptive to tobacco promotions
No	1534	11.7	1.00	1.00
Yes	257	21.8	1.69 (1.27–2.25)	0.89 (0.64–1.23)
Child characteristics
School performance
Excellent	831	8.7	1.00	1.00
Good	677	12.3	1.33 (0.88–2.03)	1.05 (0.70–1.59)
Average/below average	283	28.3	2.99 (2.23–4.02)	1.84 (1.29–2.61)
Sensation seeking
First quartile	593	6.9	1.00	1.00
Second quartile	492	12.2	1.70 (1.10–2.64)	1.34 (0.83–2.16)
Third quartile	312	17.0	2.29 (1.64–3.20)	1.50 (1.00–2.25)
Fourth quartile	394	20.6	2.68 (1.69–4.25)	1.46 (0.81–2.60)
Rebelliousness
First quartile	564	6.9	1.00	1.00
Second quartile	402	11.2	1.56 (1.05–2.34)	1.39 (0.88–2.19)
Third quartile	449	14.3	1.90 (1.40–2.59)	1.38 (0.95–2.00)
Fourth quartile	376	23.1	3.06 (2.19–4.27)	1.66 (1.03–2.65)
Self-esteem
First quartile	456	19.3	1.00	1.00
Second quartile	506	10.1	0.53 (0.40–0.69)	0.75 (0.56–0.98)
Third quartile	521	11.1	0.57 (0.43–0.77)	0.91 (0.66–1.26)
Fourth quartile	308	12.3	0.64 (0.44–0.93)	1.28 (0.91–1.80)
Parent characteristics
Maternal demandingness
First quartile	410	16.6	1.00	1.00
Second quartile	454	12.6	0.77 (0.59–0.99)	0.93 (0.75–1.14)
Third quartile	521	11.1	0.67 (0.54–0.84)	0.82 (0.64–1.05)
Fourth quartile	406	12.8	0.80 (0.61–1.04)	1.03 (0.77–1.39)
Maternal responsiveness
First quartile	344	18.0	1.00	1.00
Second quartile	384	14.3	0.76 (0.58–1.00)	1.00 (0.78–1.29)
Third quartile	472	10.4	0.58 (0.41–0.83)	0.87 (0.61–1.24)
Fourth quartile	591	11.7	0.68 (0.52–0.88)	1.04 (0.75–1.43)
Parent education
Both completed high school	1560	11.9	1.00	1.00
Neither or 1 completed high school	231	21.2	1.96 (1.39–2.74)	1.32 (0.94–1.85)
Parental disapproval of smoking
Both disapprove	1490	12.5	1.00	1.00
Neither or mixed disapprove	301	16.3	1.30 (0.95–1.78)	0.97 (0.71–1.34)

^aRR for age at baseline adjusted for gender and school. RR for gender adjusted for age and school. All other RRs adjusted for age at baseline, gender, and school.

^bRR adjusted for school and all other variables in the table.

^cFirst quartile, 0 to 531 occurrences of smoking; second quartile, 532 to 960 occurrences; third quartile 961 to 1664 occurrences; and fourth quartile, 1665 to 5308 occurrences.

^dP<.05 versus first quartile.

^eP<.001 versus first quartile.

^fP<.01 versus first quartile.

^gP<.01 versus second quartile.

^hP<.05 versus third quartile.