Table 5

Race-specific and gender-specific HR (95% CI) of SCD according to quintiles of FEV₁ by smoking status*

	Whites						Blacks
	Quintile 1 (lowest)	Quintile 2	Quintile 3	Quintile 4	Quintile 5 (highest)	P for trend†	Quintile 1 (lowest)	Quintile 2	Quintile 3	Quintile 4	Quintile 5 (highest)	P for trend†
Males, n	1048	1049	1049	1049	1048		293	293	294	293	293
Never	2.71 (1.03 to 7.13)	2.62 (0.88 to 7.83)	2.18 (0.74 to 6.43)	1.91 (0.65 to 5.57)	1.00	0.02	1.62 (1.02 to 2.57)	0.90 (0.26 to 3.09)	0.89 (0.24 to 3.32)	0.54 (0.13 to 2.20)	1.00	0.50
Former	1.92 (0.98 to 3.77)	1.74 (0.91 to 3.34)	1.33 (0.67 to 2.62)	1.31 (0.66 to 2.58)	1.00	0.03	3.15 (0.97 to 10.23)	1.99 (0.64 to 6.18)	2.15 (0.73 to 6.30) 0	1.01 (0.28 to 3.61)	1.00	0.05
Current	2.27 (1.03 to 5.00)	1.36 (0.61 to 3.05)	1.49 (0.69 to 3.24)	1.26 (0.58 to 2.73)	1.00	0.03	1.39 (0.54 to 3.58)	0.46 (0.15 to 1.46)	0.87 (0.35 to 2.20)	0.86 (0.33 to 2.25)	1.00	0.52
Females, n	1151	1151	1151	1151	1151		448	449	449	449	449
Never	1.97 (1.14 to 3.40)	0.95 (0.35 to 2.61)	0.50 (0.15 to 1.63)	0.92 (0.33 to 2.58)	1.00	0.40	4.61 (1.57 to 13.55)	3.10 (1.01 to 9.58)	2.99 (0.98 to 9.14)	1.19 (0.32 to 4.45)	1.00	0.01
Former	1.17 (0.42 to 3.29)	0.80 (0.12 to 5.37)	1.48 (0.25 to 8.66)	1.12 (0.18 to 6.87)	1.00	0.35	2.21 (0.39 to 12.41)	1.34 (0.21 to 8.64)	2.21 (0.39 to 12.41)	1.03 (0.31 to 3.42)	1.00	0.70
Current	1.73 (0.66 to 4.53)	1.47 (0.57 to 3.75)	0.80 (0.27 to 2.35)	0.73 (0.25 to 2.13)	1.00	0.04	1.44 (0.50 to 4.10)	1.54 (0.59 to 4.06)	0.71 (0.22 to 2.26)	0.91 (0.30 to 2.74)	1.00	0.22

*Adjusted for age (continuous), education level, body mass index, systolic blood pressure, hypertension, diabetes mellitus, history of heart failure, low-density lipoprotein cholesterol, fasting blood glucose, fibrinogen level, albumin level, von Willebrand factor and QTc duration.
†Linear test across median values of FEV₁ quintiles.
SCD, sudden cardiac death.