Table 4. Adjusted Time Ratios of Obesity Relative to Normal Weight and Overweight across the Life Course from Weighted Accelerated Failure-Time Regression Model, NHANES III-NHANES 2009–2010, United States.

	Model 7 a		Model 8 b		Model 9 c
	TR	95% CI	TR	95% CI	TR	95% CI
Reference BMI (18.5–29.9)
Class I obese (30.0–34.9)	0.96	0.89, 1.03	0.95	0.89, 1.02	0.94	0.86, 1.03
Class II/III obese (35.0+)	0.81	0.75, 0.88	0.82	0.76, 0.89	0.83	0.75, 0.92
Class I obese * Age	1.01	0.99, 1.02	1.01	1.00, 1.02	1.01	0.99, 1.03
Class II/III obese * Age	1.03	1.02, 1.05	1.03	1.02, 1.04	1.03	1.01, 1.06

Abbreviations: BMI, body mass index; CI, confidence interval; TR, time ratio; NHANES, National Health and Nutrition Examination Survey.

^a Assuming Weibull distribution of T, adjusted for race, gender, country of birth, marital status, education, income, health insurance, smoking status, chronic conditions and survey year.

^b Assuming gamma distribution of T, adjusted for race, gender, country of birth, marital status, education, income, health insurance, smoking status, chronic conditions and survey year.

^c Assuming log-normal distribution of T, adjusted for race, gender, country of birth, marital status, education, income, health insurance, smoking status, chronic conditions and survey year.