Table 3.
Obesity Prevalence Based on Self-reported and Measured Height and Weight, Los Angeles County Adolescents (2006-8).
| NOTE: UNWEIGHTED RESULTS, CDC OBESITY CUTOFFS. PROBLEM: RESULTS ARE NOT WEIGHTED, BUT I BELIEVE THIS IS A BETTER APPROACH AS THE TESTS OF SIGNIFANT DIFFERENCES ARE MORE ACCURATE, WHICH IS THE CRUX OF THE PAPER MORE THAN THE ABSOLUTE PREVALENCE NUMBERS. | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | |||||||||
| Based on self-reported height and weighta | Based on measured height and weight | |||||||||||
| Respondent has self-reported height and weight | Respondent does not have self-reported height and weight | All measured respondents | ||||||||||
| Prop. obese | 95% Confidence Interval | (N) | Prop. obese | 95% Confidence Interval | (N) | Prop. obese | 95% Confidence Interval | (N) | Prop. obese | 95% Confidence Interval | (N) | |
| All respondents | 0.20 | 0.16, 0.23 | (471) | 0.28* | 0.24, 0.32 | (471) | 0.32 | 0.23, 0.42 | (102) | 0.29* | 0.25, 0.33 | (573) |
| Ages 12-13 | 0.21 | 0.15, 0.29 | (145) | 0.30* | 0.23, 0.39 | (145) | 0.40 | 0.28, 0.53 | (60) | 0.33* | 0.27, 0.40 | (205) |
| Ages 14-17 | 0.19 | 0.15, 0.23 | (326) | 0.27* | 0.22, 0.32 | (326) | 0.21 | 0.10, 0.37 | (42) | 0.26* | 0.22, 0.31 | (368) |
| Short-for-age | 0.15 | 0.10, 0.20 | (238) | 0.24* | 0.18, 0.29 | (238) | 0.17 | 0.08, 0.31 | (46) | 0.23* | 0.18, 0.28 | (284) |
| Tall-for-age | 0.24 | 0.19, 0.31 | (233) | 0.33* | 0.27, 0.39 | (233) | 0.45 | 0.31, 0.59 | (56) | 0.35* | 0.30, 0.41 | (289) |
| High BMI-for-ageb | 0.40 | 0.33, 0.46 | (231) | 0.57* | 0.50, 0.64 | (231) | 0.57 | 0.43, 0.70 | (58) | 0.57* | 0.51, 0.63 | (289) |
| Girls | 0.12 | 0.08, 0.17 | (225) | 0.20* | 0.15, 0.26 | (225) | 0.27 | 0.16, 0.42 | (51) | 0.21* | 0.17, 0.27 | (276) |
| Boys | 0.26 | 0.21, 0.32 | (246) | 0.35* | 0.29, 0.42 | (246) | 0.37 | 0.24, 0.52 | (51) | 0.36* | 0.30, 0.42 | (299) |
| White | 0.07 | 0.03, 0.15 | ( 87) | 0.11 | 0.06, 0.20 | ( 87) | 0.25 | 0.00, 0.81 | ( 4) | 0.12 | 0.06, 0.21 | ( 91) |
| Hispanic | 0.23 | 0.18, 0.27 | (354) | 0.32* | 0.27, 0.37 | (354) | 0.34 | 0.24, 0.45 | (91) | 0.33* | 0.28, 0.39 | (445) |
| Black | 0.20 | 0.08, 0.39 | ( 30) | 0.27 | 0.12, 0.46 | ( 30) | 0.14 | 0.00, 0.58 | ( 7) | 0.24 | 0.12, 0.41 | ( 37) |
| Not insured last month | 0.33 | 0.23, 0.44 | ( 82) | 0.44* | 0.33, 0.55 | ( 82) | 0.48 | 0.28, 0.69 | (25) | 0.45* | 0.36, 0.56 | (107) |
| Insured last month | 0.17 | 0.13, 0.21 | (389) | 0.25* | 0.20, 0.29 | (389) | 0.27 | 0.18, 0.39 | (77) | 0.25* | 0.21, 0.29 | (466) |
| Mother's education | ||||||||||||
| < high school | 0.24 | 0.18, 0.30 | (197) | 0.37* | 0.30, 0.44 | (197) | 0.29 | 0.18, 0.42 | (59) | 0.35* | 0.29, 0.41 | (256) |
| High school /college | 0.16 | 0.12, 0.21 | (274) | 0.22* | 0.17, 0.27 | (274) | 0.37† | 0.23, 0.53 | (43) | 0.24* | 0.19, 0.29 | (317) |
*
Significantly different from self-reported obesity (Column 1) for same respondent group (same row) at p < .05 using a McNemar's test ((2) vs. (1)) or maximum likelihood estimation for overlapping samples ((4) vs. (1)).
†
Significantly different from obesity prevalence based on measured height and weight for respondents with self-reported height and weight (Column 2) for same respondent group (same row) at p < .05, using chi-squared test ((3) vs. (2)).
a
Includes only those respondents who also have measured height and weight.
b
Obesity prevalence estimates for all low BMI-for-age respondents are zero and are not shown