Research Article

A Comparison between Atlantic Canadian and National Correction Equations to Improve the Accuracy of Self-Reported Obesity Estimates in Atlantic Canada

Table 3

Mean body mass index (BMI) and mean difference between measured and self-reported or corrected BMI, by collection method, sex, and BMI category, household population aged 18 years or older, Atlantic Canada, 2007-2008.

BMI category
(range kg/m2)
Mean BMIMean difference
Collection methodCorrection methodSR minus measured95% CIAtlantic corrected minus measured95% CINational corrected minus measured95% CI
Measured SR Atlantic
CEs
National
CEs

Both sexes

UW and NW (<24.9)22.722.523.6*23.6*−0.2−0.7, 0.3 0.90.3, 1.5 0.90.3, 1.4
OW (25.0 to 29.9)27.626.5*27.627.7−1.1−1.6,
−0.7
−0.0−0.5, 0.4 0.1−0.4, 0.5
Obese (30.0 or more)34.832.0*33.3*33.5*−2.8−3.6,
−2.1
−1.6−2.3,
−0.8
−1.3−2.0,
−0.5

Males

UW and NW (<24.9)23.523.424.224.2−0.1−1.4, 1.1 0.6−0.8, 2.0 0.7−0.7, 2.0
OW (25.0 to 29.9)27.626.6*27.627.6−1.0−1.3,
−0.6
0.1−0.3, 0.4 0.1−0.3, 0.4
Obese (30.0 or more)34.131.5*32.9*32.9*−2.6−3.6,
−1.7
−1.2−2.2,
−0.2
−1.2−2.2,
−0.2

Females

UW and NW (<24.9)22.322.123.4*23.3*−0.2−0.8, 0.3 1.00.5, 1.6 1.00.4, 1.6
OW (25.0 to 29.9)27.626.3*27.527.8−1.3−2.3,
−0.4
−0.2−1.1, 0.8 0.1−0.9, 1.1
Obese (30.0 or more)35.732.6*33.7*34.4*−3.1−4.3,
−1.9
−2.0−3.2,
−0.9
−1.3−2.5,
−0.1

*Significantly different from estimate for measured (P < 0.05).
Abbreviations: CE, correction equation; CI, confidence interval; NW, normal weight; OW, overweight; SR, self-reported; UW, underweight.
Data Source: 2007-2008 Canadian Community Health Survey, Statistics Canada.