. Author manuscript; available in PMC: 2020 Mar 1.

Published in final edited form as: Am J Health Behav. 2019 Mar 1;43(2):380–392. doi: 10.5993/AJHB.43.2.14

Table 2.

Mean Cigarettes per Day (CPD), Plasma Cotinine per Cigarette, and Exhaled Carbon Monoxide (eCO) by Usual Brand Rod Length (Visit 2) versus Normal Nicotine Content (NNC) SPECTRUM (Visit 3)

	Usual Brand	NNC SPECTRUM	p-value
Usual Length Short (ULS)
Mean CPD (SD)	22.5 (11.8)	26.0 (14.0)	.01^*
Mean plasma cotinine per cigarette (SD)	18.2 (9.4)	13.9 (5.5)	.05
Mean exhaled CO, in ppm (SD)	30.7 (11.9)	34.3 (16.5)	.50
Usual Length Medium/King (ULM)
Mean CPD (SD)	21.0 (11.1)	22.4 (11.5)	.001^*
Mean plasma cotinine per cigarette (SD)	15.7 (11.3)	12.6 (6.7)	<.001^*
Mean exhaled CO, in ppm (SD)	29.6 (15.8)	31.7 (16.9)	<.001^*
Usual Length Long (ULL)
Mean CPD (SD)	18.1 (8.6)	22.9 (12.5)	<.001^*
Mean plasma cotinine per cigarette (SD)	17.5 (9.2)	12.7 (7.1)	<.001^*
Mean exhaled CO, in ppm (SD)	28.0 (15.0)	30.6 (16.1)	<.001^*

Note.

Indicates p < .05 when comparing usual brand to NNC SPECTRUMs using Wald test from corresponding linear mixed models.