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Table 3 Mean BMI (kg/m 2 ) at various ages by gender

From: Weight status of adolescents in secondary schools in port Harcourt using Body Mass Index (BMI)

Age Males Females P value
(Years) No. Mean ± SD No. Mean ± SD  
10 15 17.25 ± 2.66 25 16.34 ± 2.11 0.20
11 32 16.20 ± 1.68 27 17.22 ± 3.60 0.70
12 61 17.38 ± 2.21 71 19.21 ± 3.09 0.00*
13 60 18.00 ± 2.41 71 19.84 ± 3.07 0.00*
14 80 19.06 ± 2.29 81 20.13 ± 2.93 0.01*
15 74 19.61 ± 1.99 92 20.34 ± 2.90 0.06
16 54 19.50 ± 1.78 56 21.38 ± 4.59 0.00*
17 50 20.72 ± 2.44 35 21.57 ± 3.05 0.15
18 35 20.82 ± 2.29 15 23.23 ± 3.20 0.00*
19 20 21.60 ± 2.15 6 22.85 ± 2.07 0.22
Total 481 19.01 ± 2.58 479 20.01 ± 3.50 0.00*
  1. * = Significant