Table 4.

Stratified analyses of the associations between the composite dietary antioxidant index and stroke

Characteristics	Quintile 1	Quintile 2	Quintile 3	Quintile 4	Quintile 5	P for interaction
Sex						0.135
Male	Ref.	0.88 (0.62-1.24)	0.58 (0.39-0.88)	0.63 (0.40-0.99)	0.58 (0.34-0.98)
Female	Ref.	0.60 (0.40-0.88)	0.77 (0.52-1.14)	0.82 (0.53-1.26)	0.56 (0.33-0.95)
Age in years						0.088
≤ 60	Ref.	0.44 (0.25-0.78)	0.46 (0.25-0.85)	0.74 (0.41-1.34)	0.41 (0.19-0.88)
> 60	Ref.	0.88 (0.65-1.17)	0.80 (0.58-1.11)	0.74 (0.52-1.07)	0.68 (0.45-1.03)
BMI						0.300
< 30	Ref.	0.65 (0.45-0.95)	0.48 (0.31-0.74)	0.57 (0.36-0.91)	0.45 (0.26-0.79)
≥ 30	Ref.	0.81 (0.58-1.14)	0.85 (0.60-1.21)	0.86 (0.58-1.26)	0.67 (0.42-1.07)
Race						0.424
White	Ref.	0.75 (0.50-1.13)	0.86 (0.55-1.33)	0.94 (0.58-1.51)	0.74 (0.42-1.31)
Others	Ref.	0.73 (0.52-1.02)	0.56 (0.38-0.81)	0.59 (0.39-0.88)	0.48 (0.29-0.78)
Smoker						0.611
Yes	Ref.	0.68 (0.49-0.95)	0.54 (0.37-0.79)	0.67 (0.45-1.00)	0.48 (0.29-0.78)
No	Ref.	0.77 (0.51-1.16)	0.83 (0.54-1.27)	0.74 (0.46-1.19)	0.67 (0.39-1.17)
Drinker						0.225
Yes	Ref.	0.61 (0.42-0.88)	0.44 (0.29-0.68)	0.52 (0.33-0.81)	0.40 (0.24-0.68)
No	Ref.	0.94 (0.59-1.48)	0.89 (0.54-1.47)	1.04 (0.61-1.78)	0.84 (0.44-1.59)
Hypertension						0.843
Yes	Ref.	0.75 (0.57-1.00)	0.66 (0.48-0.90)	0.71 (0.51-1.00)	0.55 (0.36-0.82)
No	Ref.	0.69 (0.36-1.30)	0.87 (0.44-1.71)	0.84 (0.40-1.75)	0.79 (0.32-1.91)
Hypercholesterolemia						0.375
Yes	Ref.	0.68 (0.49-0.95)	0.66 (0.46-0.95)	0.57 (0.38-0.85)	0.47 (0.29-0.76)
No	Ref.	0.87 (0.56-1.34)	0.61 (0.37-1.00)	1.01 (0.61-1.70)	0.72 (0.38-1.34)

The odds ratio and 95% confidence interval were obtained from multivariable logistic regression models after adjusting for age, sex, race, education, marital status, poverty income ratio, drinker, smoker, body mass index, energy intake, hypertension and hypercholesterolemia. BMI: Body mass index; Ref.: Reference.