Table 2.
Changes in Weight and Secondary Outcome Measures by Randomized Maintenance Condition (Phone, Newsletter)
| Outcome Measure | Baseline Mean (SD) | 4 Monthsa (Phone = 162 and Newsletter = 160) | 12 Monthsb (Phone = 156 and Newsletter = 156) | Group pc | 24 Months (Phone = 149 and Newsletter = 151) | Group pc |
|---|---|---|---|---|---|---|
| Weight (%) | ||||||
| Phone | — | −6.7 (−7.5, −5.9) | −7.4 (−8.9, −5.9) | .01 | −5.1 (−6.6, −3.5) | .57 |
| Newsletter | — | −6.3 (−8.3, −4.3) | −6.1 (−8.6, −3.6) | −4.8 (−7.3, −2.2) | ||
| Weight (kg) | ||||||
| Phone | 91.6 (16.6) | −6.1 (−6.6, −5.6) | −6.6 (−7.5, −5.8) | .01 | −4.5 (−5.5, −3.6) | .45 |
| Newsletter | 89.8 (14.6) | −5.7 (−7.0, −4.5) | −5.1 (−7.2, −3.0) | −4.0 (−6.3, −1.8) | ||
| BMI (kg/m2) | ||||||
| Phone | 34.1 (5.6) | −2.3 (−2.5, −2.1) | −2.4 (−2.7, −2.1) | .02 | −1.6 (−1.9, −1.2) | .61 |
| Newsletter | 33.5 (5.1) | −2.1 (−2.6, −1.7) | −1.9 (−2.7, −1.1) | −1.5 (−2.3, −0.6) | ||
| Waist (cm) | ||||||
| Phone | 111.0 (12.7) | −5.2 (−5.9, −4.6) | −5.3 (−6.4, −4.2) | .15 | −3.7 (−4.9, −2.4) | .51 |
| Newsletter | 110.7 (11.2) | −4.9 (−6.5, −3.3) | −4.1 (−6.8, −1.4) | −3.1 (−6.2, −0.1) | ||
| Total cholesterol (mg/dL) | ||||||
| Phone | 185.7 (35.2) | −11.6 (−15.5, −7.7) | −5.0 (−9.3, −0.8) | .25 | +0.8 (−3.6, +5.3) | .84 |
| Newsletter | 186.8 (39.7) | −10.9 (−20.4, −1.5) | −1.5 (−11.8, +8.8) | +0.2 (−10.5, +10.9) | ||
| High-density lipoprotein cholesterol (mg/dL) | ||||||
| Phone | 55.1 (17.5) | −4.4 (−6.0, −2.9) | +4.8 (+3.2, +6.4) | .11 | +5.3 (+3.6, +7.0) | .01 |
| Newsletter | 56.5 (16.9) | −5.6 (−9.3, −1.9) | +2.9 (−1.1, +6.9) | +2.3 (−1.8, +6.3) | ||
| Replace with spell-out: Low-density lipoprotein cholesterol (mg/dL) | ||||||
| Phone | 103.9 (29.9) | −3.2 (−6.8, +0.4) | −5.8 (−9.8, −1.9) | .09 | −3.2 (−7.4, +1.0) | .14 |
| Newsletter | 104.3 (32.7) | −0.7 (−9.4, +7.9) | −1.1 (−10.6, +8.4) | +1.2 (−8.9, +11.3) | ||
| Triglyceride (mg/dL) | ||||||
| Phone | 133.0 (57.9) | −19.8 (−27.3, −12.7) | −20.1 (−28.2, −12.1) | .53 | −9.6 (19.5, +0.3) | .60 |
| Newsletter | 129.9 (63.2) | −20.3 (−37.7, −2.9) | −16.5 (−36.0, +3.0) | −5.9 (−29.8, +18.0) | ||
| Glucose (mg/dL) | ||||||
| Phone | 95.6 (9.7) | −1.2 (−2.5, +0.2) | −2.3 (−3.6, −0.9) | .21 | +1.7 (+0.2, +3.3) | .89 |
| Newsletter | 94.8 (10.4) | −0.9 (−4.3, 2.4) | −1.1 (−4.3, +2.3) | +1.9 (−1.9, +5.6) | ||
| Systolic (mmHg) | ||||||
| Phone | 133.0 (17.5) | −8.6 (−11.1, −6.1) | −2.6 (−5.2, +0.004) | .60 | −2.2 (−5.0, +0.6) | .77 |
| Newsletter | 131.2 (16.6) | −8.7 (−14.8, −2.7) | −1.6 (−8.0, +4.7) | −1.6 (−8.4, +5.2) | ||
| Diastolic (mmHg) | ||||||
| Phone | 76.7 (10.0) | −4.9 (−6.3, −3.5) | −3.5 (−4.8, −2.1) | .15 | −2.3 (−3.8, −0.8) | .62 |
| Newsletter | 75.9 (8.8) | −4.8 (−8.2, −1.4) | −2.1 (−5.4, +1.2) | −1.8 (−5.3, +1.8) |
Note: BMI = body mass index. Bold/italicized numbers represent p-values at the significance level of .05 or lower.
aFour-month (pre-randomization) changes were not significantly different between groups.
bBlood specimen for 1 participant could not be processed at 12 months.
cAll 12- and 24-month change comparisons, between groups, were adjusted for baseline BMI.