Table 1. Participant Characteristics at National Weight Control Registry Enrollment by Self-Reported Physical Activity Level.
| Total Kcals/Week PA at Enrollment | P-Value for Linear Trend† | |||||
|---|---|---|---|---|---|---|
|
| ||||||
| <1000 (n = 910) | 1000-<2250 (n = 934) | 2250-<3500 (n = 779) | 3500+ (n = 968) | |||
| Weekly Energy Expenditure (kcal/day) Mean ±SE (Median) | 416.13±10.40 (364) | 1614.55±11.62 (1602) | 2255.92±19.85 (2850) | 5476.87±70.04 (4853) | <0.0001 | |
|
| ||||||
| Age * | 49.39 ±13.02 | 47.94 ±12.74 | 45.51 ±11.97 | 44.35 ±11.26 | <.0001 | |
| Gender | Female | 78.4% | 78.5% | 73.9% | 72.4% | .002‡ |
| Male | 21.6% | 21.5% | 26.1% | 27.6% | ||
| Ethnicity | Caucasian | 95.6% | 95.6% | 96.1% | 94.7% | .751⊥ |
| African-American | 2.3% | 2.3% | 1.7% | 1.8% | ||
| Asian | .1% | .2% | .4% | .4% | ||
| Hispanic | 1.1% | 1.1% | 1.2% | 1.8% | ||
| Other | .9% | .9% | .6% | 1.3% | ||
| Marital Status | Married | 66.5% | 64.7% | 65.7% | 61.1% | <.0001⊥ |
| Separated | 1.2% | 2.4% | 1.8% | 1.4% | ||
| Divorced | 12.0% | 12.4% | 10.4% | 11.1% | ||
| Widowed | 5.2% | 3.5% | 2.1% | 2.0% | ||
| Never married | 12.0% | 13.0% | 15.6% | 18.5% | ||
| Not married (living w/significant other) | 2.7% | 3.4% | 3.6% | 4.2% | ||
| Other | .4% | .5% | .9% | 1.7% | ||
| Education Level | Grade school | .0% | .0% | .0% | .0% | <.0001⊥ |
| Junior high school | .2% | .2% | .3% | .0% | ||
| High school | 15.3 | 10.3% | 7.2% | 6.5% | ||
| Vocational training | 7.9% | 5.6% | 4.2% | 5.3% | ||
| Some college (< 4 yrs) | 27.2% | 22.8% | 21.2% | 22.2% | ||
| College/university degree | 23.9% | 26.1% | 29.6% | 30.7% | ||
| Graduate or professional | 25.4% | 35.0% | 37.5% | 35.3% | ||
| Enrollment Weight (kg) †† | 73.47±0.48 | 71.93±0.47 | 70.98±0.52 | 70.12±0.46 | <.0001 | |
| Enrollment BMI (kg/m²)†† | 25.77±0.15 | 25.20±0.15 | 24.68±0.17 | 24.51±0.15 | <.0001 | |
| Maximum Pre-Enrollment Weight (kg) †† | 104.33±0.83 | 103.75±0.81 | 103.51±0.89 | 105.14±0.80 | .553 | |
| Maximum Pre-Enrollment BMI (kg/m²)†† | 36.69±0.27 | 36.36±0.27 | 36.05±0.29 | 36.76±0.27 | .940 | |
| Weight Change (Maximum-Enrollment, kg) †† | 30.86±0.55 | 31.82±0.54 | 32.07±0.60 | 35.02±0.54 | <.0001 | |
| Weight Maintenance Duration (months) †† | 67.26±2.90 | 65.96±2.85 | 68.95±3.14 | 70.22±2.82 | .359 | |
| Smoker (%) | 12.72±0.97 | 7.50±0.95 | 6.44±1.04 | 6.52±0.94 | <.0001 | |
*
Data reported as mean ± standard deviation
†
p-values calculated from a general linear model with polynomial contrasts.
‡
p-values calculated from logistic regression model with polynomial contrasts
⊥
Pearson's chi-square p-value
††
Data reported as mean ± standard error, adjusted to the sample mean age and proportion male estimated using a general linear model.