. 2018 Dec 5;21(12):1665–1672. doi: 10.1093/ntr/nty228

Table 2.

Associations Among Study Predictors

		1	2	3	4	5	6	7	8	9	10	11	12
1	Cotinine (6 mo)
2	Cotinine (15 mo)	0.56
3	Cotinine (24 mo)	0.57	0.66
4	Cotinine (48 mo)	0.52	0.54	0.59
5	Prenatal smoking	0.42	0.41	0.43	0.41
6	Postnatal cigarettes per day^a	0.46	0.48	0.49	0.49	0.69
7	High school degree	−0.22	−0.23	−0.22	−0.29	−0.14	−0.19
8	College degree	−0.38	−0.38	−0.44	−0.40	−0.25	−0.26	0.17
9	Income/needs ratio^a	−0.37	−0.40	−0.38	−0.38	−0.20	−0.24	0.22	0.53
10	Residential instability^a	0.34	0.33	0.30	0.36	0.23	0.25	−0.22	−0.29	−0.37
11	Occupant instability^a	0.31	0.30	0.28	0.31	0.22	0.24	−0.22	−0.25	−0.33	0.58
12	% time in center care^a	−0.05	−0.11	−0.12	−0.11	−0.08	−0.09	0.11	0.07	0.09	0.01	−0.04
	N	1118	935	899	932	1209	1214	1218	1218	1212	1057	1057	1218

^aComposite variables aggregated across multiple assessments. Cotinine at each time point reflects the ordinal classification of exposure.