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Difference in constant systematic error in reporting of fruit and vegetable intake between intervention and control groups
| Visit timeline | βa | p |
|---|---|---|
| Baseline | 0.02 | 0.78 |
| 6 months follow-up | −0.03 | 0.70 |
| 12 months follow-up | 0.004 | 0.96 |
| 18 months follow-up | −0.001 | 0.99 |
aEstimated by regressing treatment assignment and fruit and vegetable intake on serum carotenoids, where the slope of treatment assignment indicates difference in constant systematic error between intervention and control
