. 2010 Dec 3;10:748. doi: 10.1186/1471-2458-10-748

Table 3.

Results of the hierarchical logistic regression for factors associated with recent tobacco smoking among boys in private high schools (n = 1227)

	step 1	R²		step 2	R²	ΔR²	step 3	R²	ΔR²	step 4	R2	ΔR2
		0.09			0.13	0.04		0.15	0.02		0.23	0.08
Parameter	OR	CI 95%	p	OR	CI 95%	p	OR	CI 95%	p	OR	CI 95%	p
*Age*	1.84	(1.43-2.36)	0.00	1.82	(1.39-2.38)	0.00	1.78	(1.39-2.23)	0.00	1.71	(1.33-2.21)	0.00
*Tuition*
Over US$ 480	3.54	(1.53-8.14)	0.00	3.70	(1.61-8.51)	0.00	3.61	(1.59-8.21)	0.00	2.29	(0.92-5.71)	0.07
US$ 261-US$ 480	2.29	(0.92-5.71)	0.07	2.43	(0.96-6.14)	0.06	2.52	(1.00-6.36)	0.05	2.02	(0.75-5.49)	0.15
US$ 191-US$ 260	1.99	(0.74-5.34)	0.16	2.08	(0.77-5.61)	0.14	1.99	(0.76-5.24)	0.15	1.65	(0.57-4.75)	0.33
Up to US$ 190	1.00	.	.	1.00	.	.	1.00	.	.	1.00	.	.
*Someone you live with smokes*
Yes				1.68	(1.25-2.26)	0.00	1.68	(1.25-2.27)	0.00	1.52	(1.00-2.29)	0.05
No				1.00	.	.	1.00	.	.	1.00	.	.
*Parental marital status*
One or both died				3.56	(1.53-8.31)	0.00	3.19	(1.53-6.65)	0.00	3.75	(1.78-7.85)	0.00
Don't live together				1.20	(0.76-1.90)	0.40	1.15	(0.70-1.84)	0.55	1.20	(0.79-1.82)	0.38
Live together				1.00	.	.	1.00	.	.	1.00	.	.
*Do you have a religion*
No							2,22	(1.55-3.17)	0.00	1.99	(1.41-2.81)	0.00
Yes							1.00	.	.	1.00	.	.
*Goes out with friends at night*
At least once a week										8.82	(3.96-19.67)	0.00
1 to 3 times a month										2.46	(1.02-5.92)	0.04
Not even once										1.00	.	.