Table 1.
Demographic, Weight and Neurocognitive Variables for Full and Included Samples
| Full sample: N = 314 | Included sample: N = 184 | |
|---|---|---|
| Variable | N (Percentage) | N (Percentage) |
| Gender | Male: 97 (30.9) | Male: 47 (25.5) |
| Female: 217 (69.1) | Female: 137 (74.5) | |
| **Education (highest level completed) | < Primary school: 28 (8.9) | < Primary school: 20 (10.9) |
| Some Secondary School: 163 (51.9) | Some Secondary School: 100 (54.3) | |
| Completed Secondary School: 123 (39.2) | Completed Secondary School: 64 (34.8) | |
| Marital Status # | Married/ Cohabitating: 138 (43.9) | Married/ Cohabitating: 52 (28.3) |
| Never Married: 119 (37.9) | Never Married: 98 (53.3) | |
| Divorced/ Separated/ | Divorced/ Separated/ | |
| Widowed: 57 (18.2) | Widowed: 34 (18.5) | |
| Employment | Yes: 122 (38.9) | Yes: 63 (48.2) |
| No: 192 (61.1) | No: 121 (65.8) | |
| Monthly Income | < R1500: 46 (14.6) | < R1500: 24 (13.6) |
| R1500 – R3000: 86 (27.4) | R1500 - R3000: 54 (30.5) | |
| R3000 - R6000: 77 (24.5) | R 3000 - R6000: 49 (27.7) | |
| R6000 – R12000: 49 (15.6) | R6000 - R12000: 24 (13.6) | |
| > R12000: 41 (13.1) | > R12000: 26 (14.7) | |
| Weight Perceived Correctly | Yes: 209 (66.6) | NA |
| No: 105 (33.4) | ||
| Underestimated Weight | Yes: 92 (29.3) | NA |
| No: 222 (70.7) | ||
| Overestimated Weight | Yes: 13 (4.1) | NA |
| No: 301 (95.9) | ||
| **Ever overweight/ obese | Yes: 141 (44.9) | Yes: 105 (57.1) |
| No: 173 (55.1) | No: 79 (42.9) | |
| **Weight changes in previous year | Yes – weight increased: 69 (22) | Yes – weight increased: 49 (26.6) |
| Yes – weight decreased: 45 (14.3) | Yes – weight decreased: 24 (13.0) | |
| No: 200 (63.7) | No: 111 (60.3) | |
| **Family member overweight | Yes: 118 (37.6) | Yes: 76 (41.3) |
| No: 190 (60.5) | No: 108 (58.7) | |
| **Told to maintain healthy weight by health-care professional | Yes: 119 (37.9) | Yes: 77 (41.8) |
| No: 195 (62.1) | No: 107 (58.2) | |
| Variable | Mean (SD) | Mean (SD) |
| *Age in years # | 45.82 (15.62) | 49.34 (14.97) |
| Range: 18.06–81.12 | Range: 18.25–81.12 | |
| Waist Circumference # | 91.13 (15.77) | 95.37 (10.47) |
| **Body Mass Index | 29.65 (7.68) | 31.37 (3.95) |
| Self-Reflectiveness | 3.41 (5.32) | 3.32 (5.65) |
| **Self- Certainty | 9.75 (3.39) | 9.65 (3.42) |
| *BCIS Total | 13.17 (4.94) | 12.97 (5. 51) |
| **RBANS Immediate Memory | 44.58 (7.87) | 44.01 (7.85) |
| RBANS Visuospatial | 32.25 (4.64) | 32.27 (4.12) |
| *RBANS Language | 27.58 (5.67) | 27.61 (4.52) |
| **RBANS Attention | 47.39 (12.91) | 46.20 (12.77) |
| **RBANS Delayed Recall | 47.65 (7.54) | 47.23 (7.43) |
| **RBANS Total | 199.35 (29.11) | 197.11 (28.44) |
| **Global IQ (WASI) | 67.33 (15.61) | 68.61 (13. 54) |
| RFFT Error Ratio | 0.17 (0.21) | .16 (0.20) |
| Stroop Interference | −1.58 (7.84) | −2.40 (8.54) |
| *Spatial Span Backwards | 6.07 (2.18) | 5.92 (2.14) |
| Digit Span Backwards | 5.29 (2.21) | 5.25 (2.34) |
| Total Executive Function (z-score) | 0.03 (2.47) | −0.04 (2.48) |
| Total Neurocognition (z-score) | −0.03 (3.13) | − 0.27 (3.10) |
Numbers may not add up to 100% due to missing values
BCIS: Beck Cognitive Insight Scale, IQ: Intelligence Quotient, RBANS: Repeatable Battery for the Assessment of Neuropsychological Status, WASI: Wechsler Abbreviated Scale of Intelligence
# Full and included samples differed significantly with regard to age, marital status and waist circumference
*: relationship with correct perception of body weight in included sample - p ≤ 0.10
**: relationship with correct perception of body weight in included sample - p ≤ 0.05