Table 2.

Observed means and estimated means and 95% CI for 3-month weight loss (3 month—baseline weight) from linear mixed model adjusted for baseline outcome, patient, physician and visit factors^a (n = 389 in model for weight and physical activity; 72 observations deleted due to missing data; n = 390 in model for nutrition; 71 observations deleted due to missing data)

Main predictor	N a	Outcomes		P-valuec
		Observed 3-month change	Estimated mean 3-month change (95% CI)b
Weight outcome expectation		Weight change		0.15
No weight discussion	188	0.6	0.6 (−0.1 to 1.2)
Somewhat to not at all likely to follow weight recommendation	134	−0.0	−0.1 (−0.8 to 0.5)
Likely to extremely likely to follow weight recommendation	134	−0.5	−0.4 (−1.1 to 0.2)
Nutrition outcome expectation		Fat change		0.24
No nutrition discussion	167	−0.1	−0.1 (−0.0 to −0.1)
Somewhat to not at all likely to follow nutrition recommendation	136	−0.1	−0.1 (0.0 to −0.1)
Likely to extremely likely to follow nutrition recommendation	154	−0.1	−0.1 (−0.1 to −0.2)
Physical activity outcome expectation		Physical activity change		0.08
No physical activity discussion	114	0.4	1.0 (0.3 to 1.7)
Somewhat to not at all likely to follow physical activity recommendation	164	0.2	0.0 (−0.5 to 0.5)
Likely to extremely likely to follow physical activity recommendation	178	0.4	0.3 (−0.2 to 0.8)

Note: Forty primary care physicians and 461 of their overweight or obese patient visits were audio recorded between December 2006 and June 2008 in Durham and Oxford, NC.

^aFive missing whether weight or physical activity discussed and four missing whether nutrition discussed.

^bEstimates from linear mixed model adjusted for clustering with outcomes of weight change for weight outcome expectations, fat change for nutrition outcome expectations and physical activity change for physical activity outcome expectations, baseline assessment of outcome, patient, physician and visit level covariates, 72 observation deleted due to missing outcome or covariates for weight and physical activity, 71 observations deleted for nutrition.

^c P-value from type 3 test from the three level main predictor categorical variable.