# Table 4 Prevalence of normal, below-normal (low) and above-normal (high) Body Mass Index (BMI) of 11-13-year-old schoolchildren according to various variables

Dependent variable
Variables N BMI < normal
N = 529
N (%)
BMI normal
N = 1403
n (%)
BMI > normal
N = 19
n (%)
Chi-square
P value*
Gender
Girls 1002 234 (23.4) 762 (76.1) 6 (0.6) P < 0.001
Boys 949 295 (31.1) 641 (67.5) 13 (1.4) P < 0.001
Socio-economic
Rural 973 277 (28.5) 688 (70.7) 8 (0.8) P = 0.18
Urban 978 252 (25.8) 715 (73.1) 11 (1.1) P = 0.18
TV at home - yes 1443 373 (25.9) 1053 (73.0) 17 (1.2) P = 0.04
TV at home - no 508 156 (30.7) 350 (68.9) 2 (0.4) P = 0.04
Siblings 0-4* 1201 291 (24.2) 892 (74.3) 18 (1.5) P < 0.001
Siblings >4* 742 234 (31.5) 507 (68.3) 1 (0.1) P < 0.001
Caries status
DMFT + dmft = 0 346 86 (24.9) 256 (74.0) 4 (1.2) P = 0.30
DMFT + dmft >0 1605 443 (27.6) 1147 (71.5) 15 (0.9) P = 0.30
PUFA + pufa = 0 865 198 (22.9) 655 (75.7) 12 (1.4) P < 0.001
PUFA + pufa >0 1086 331 (30.5) 748 (68.9) 7 (0.6) P < 0.001
PUFA + pufa = 1 439 129 (29.4) 307 (69.9) 3 (0.7) P = 0.52
PUFA + pufa >1 647 202 (31.2) 441 (68.2) 4 (0.6) P = 0.52
1. * 8 children not included in this variable due to incomplete data
2. Due to small numbers in the high BMI cell, P-values were calculated on dichotomised BMI classes (low versus normal + high).