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. Author manuscript; available in PMC: 2013 May 28.
Published in final edited form as: Epidemiology. 2007 Jul;18(4):461–468. doi: 10.1097/EDE.0b013e31806462d3

Table 4.

Results of fitting adjusted models of the carotid artery thickness in relation toserum lycopene concentration, according to sampling method and method of data analysis.

Sampling method n Analysis method β̂1 SE(β) p
All available subjects 1028 OLS −0.14 0.04 0.0011
Random sample 400 OLS −0.10 0.06 0.096
Random sample plus
outcome tail samples2 		400 weighted OLS −0.19 0.08 0.017
Random sample plus
outcome tail samples2 		400 Zhou et al.
estimator		 −0.24 0.07 0.0009

NOTE:

1

Units are mm per mol/L, adjusted for age, year, and sonographer.

2

200 subjects selected at random, 100 with carotid artery thickness above the 90th percentile selected a random, and 100 with carotid artery thickness below the 10th percentile selected a random (see text).