The regression of reported BMI by gender and body shape perception gave the most balanced results for both genders : the Kappa and ICC obtained were @ @ % CI = -LSB- @-@ @ -RSB- and @ , @ % CI = -LSB- @-@ @ -RSB- for boys ; @ @ % CI = -LSB- @-@ @ -RSB- and @ , @ % CI = -LSB- @-@ @ -RSB- for girls .