Table 2.

Threshold effect analysis of the relationship between Omega-3 intake and phenoptypic age acceleration.

Outcome	β	95% CI	P-value
All model
One-line linear regression model	−0.071	−0.119, −0.024	0.004
Two-piecewise linear regression model
Inflection point	1.103
Omega-3 intake < 1.103 (gram/day)	−0.482	−0.716, −0.248	0.0001
Omega-3 intake ≥ 1.103 (gram/day)	−0.041	−0.086,0.004	0.0753
P for log-likelihood ratio test	<0.001		<0.001
Male Model
One-line linear regression model	−0.055	−0.105, −0.004	0.035
Two-piecewise linear regression model
Inflection point	0.461
Omega-3 intake < 0.461 (gram/day)	−2.921	−4.688, −1.155	0.0012
Omega-3 intake ≥ 0.461 (gram/day)	−0.064	−0.113, −0.015	0.011
P for log-likelihood ratio test			0.002

Adjusted for age, gender, race, PIR, education, BMI, marital status, smoke, alcohol, physical activity, HEI, diabetes, hypertension, hyperlipidemia, and cancer.