APPLICATION OF BODY MASS INDEX PRINCIPLES: RESULTS

17 Dec
2009

Table 2 outlines the demographics of each of the five classes assessed. Data were obtained from the Nutstat module of Epi Info.6 The ages in months for each grade reflect that this study was completed in the spring of the academic school year. Because the 54 black students made up more than 80% of the student body, we only analyzed data pertaining to them. The remaining 12 students were of Asian, Hispanic, and white background.


Table 2. Demographics of the Five Grades Assessed Of the 66 students, 54 were black. Percentiles reflect BMI for age and sex according to the Nutstat module of Epi Info.

Grade

Percentiles of Blacks:

>85>85 <90

>90 <95

>95

Grade 1:15 students (age 82.6±7.2 months)10 ot 13

BM 0, BF 0

BM 0, BF 3

BM 3, BF 4

Grade 2:

15 students (age 100.6±6.5 months)

10 of 11

BM 0, BF 1

BM 0, BF 3

BM 4, BF 2

Grade 3:

13 students (age 108.9±6.4 months)

8 of 9

BM 0, BF 0

BM 2, BF 1

BM 2, BF 3

Grade 4:

10 students (age 122.0±3.6 months)

9 of 10

BM 0, BF 0

BM 1, BF 0

BM 3, BF 5

Grade 5:

13 students (age 134.8±3.4 months)

11 of 11

BM 0, BF 2

BM 0, BF 2

BM 3, BF 4

Total48 of 54

BM 0, BF 3

BM 3, BF 9

BM 15, BF 18

Figure 4 shows the percentiles for age and sex of black students at or above the 85th percentile of BMI. More than 50% of all black students met or exceeded the 95th percentile (that is, a z-score of 1.64 or more). canadian antibiotics

Figure 4. Percentiles for Age and Sex

Figure 4. Percentiles for Age and Sex of Black Students Reaching at Least the 85th Percentile of BMI

The mean z-score of the 19 black male students was 2.07 ± 0.90, putting them at the 98.08th percentile. The mean z-score of the 35 black female students was 1.68 ± 0.93, putting them at the 95.35th percentile. Either with equal variances assumed or equal variances not assumed, differences between male and female z-scores did not reach statistical significance (p value for equal variances assumed was 0.144 and p value for equal variances not assumed was 0.143).

Table 3. BMI and Percentile Definitions

Adult Weight by Grade
GradeBMI kg/m2
0 (normal)>18.5 <25
1 (overweight)>25 <30
2 (obese)>30 <40
3 (morbid obesity)>40
Adult Obesity by Class
ClassBMI kg/m2
1>30 <35
CM>35 <40
3>40
Childhood and Adolescent Weight
GroupPercentile
At risk for overweight>85th <95th
Overweight>95th
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