Table 1.

Study Measurement by Assessment Time Point

	Assessment time point
Measurement	BL	2-Wk D/C	2-Mo D/C	6-Mo D/C
Interview and self-report	X	X	X	X
Surface nicotine (THS)	X	—	—	X ( n = 22)
Air-nicotine monitor	—	—	X	X
Urine cotinine	—	X	X	X

X = data collected; — = data not collected; BL = baseline; 2-Wk D/C = 2 weeks post-NICU discharge; 2-Mo D/C = 2 months post-NICU discharge; 6-Mo D/C = 6 months post-NICU discharge; THS = thirdhand smoke. Air nicotine levels and urine cotinine were not assessed at baseline because the infant was hospitalized in the NICU and had no opportunity for exposure.