Table 4.

Distribution (%) of offspring perception of sibling and peer behaviors within offspring smoking variables.

	Offspring smoking variables:
	Never tried cigarette	Ever tried cigarette	Regular smoking	Nicotine Dependence1)
	N=628	N=667	N=310	N=314
no full biological siblings	87.9	90.1	88.4	85.0
any full biological siblings	12.1	9.9	11.6	15.0
any sibling problem/excessive drinker:	16.4	21.9	20.3	25.2**
any sibling use illicit drugs
none	74.8	53.9	41.5	44.8**
cannabis only	13.2	26.2	27.9	21.4
cannabis and other drugs	12.0	19.9	30.6	33.8
sibling support mean (± S.E.)	6.8±0.14	7.1±0.13	6.8±0.20	6.4±0.21
Current friends smoke:
none	71.1	42.9	22.3	11.3**
a few	23.4	36.1	34.0	27.4
a quarter or more	6.6	21.0	43.7	61.3
Current friends drink at least 1/week:
none	55.1	21.1	13.6	15.8**
a few	24.8	33.9	32.4	21.0
quarter or more	20.1	45.0	54.1	63.2
Current friends use drugs:
none	59.7	27.0	11.7	9.4**
a few	27.0	40.2	36.0	26.5
quarter or more	13.3	32.8	52.3	64.2
school peer smoking:
none/ a few	31.7	18.8	12.3	11.7**
quarter to one-half	55.9	61.9	66.3	60.8
one-half or more	12.4	19.4	21.4	27.5
school peer drinking:
none/ a few	25.9	11.4	6.2	7.8**
quarter to one-half	44.3	44.0	39.2	36.6
one-half or more	29.8	44.6	54.7	55.7
school peer drug use:
none/ a few	44.4	31.5	24.6	18.8**
quarter to one-half	46.6	53.3	50.2	53.1
one-half or more	9.0	15.2	25.2	28.2

¹⁾The Fagerstrom Test for Nicotine Dependence (FTND) was used to define nicotine dependence Chisq:

*p<0.05,

^**p<0.01