Influence of menstrual cycle phase on resting-state functional connectivity in naturally cycling, cigarette-dependent women

Table 1 Participant characteristics

	All N = 38	Follicular phase n = 22	Luteal phase n = 16	p
Demographics
Age	33.9 ± 1.7	32.4 ± 2.3	35.9 ± 2.5	0.31
African American (n), %	50.0 (19)	50.0 (11)	50.0 (8)	1.00
Years of education	14.4 ± 0.3	14.4 ± 1.8	14.5 ± 2.6	0.90
Smoking characteristics
Cigarettes per day	12.6 ± 0.7	11.5 ± 0.9	13.9 ± 1.1	0.12
Years smoking	14.6 ± 1.8	12.7 ± 2.4	17.3 ± 2.5	0.21
Pack years^a	10.3 ± 1.5	8.6 ± 2.0	12.7 ± 2.3	0.20
FTND scores	4.4 ± 0.3	4.1 ± 0.3	4.9 ± 0.4	0.13

FTND Fagerström test for nicotine dependence, FTND scores ranged from 1 to 9
^aPack years calculation: cigarettes per day (÷) cigarettes in a pack (×) years smoking