От оно как

На 10 девчонок по статистике 9 ребят далеко не везде.
Нидерланды:

At birth: 1.05 male/female
Under 15: 1.05 male/female
15-64 years: 1.02 male/female
65-over: 0.75 male/female

Бельгия:

At birth: 1.04 male(s)/female
Under 15 years: 1.04 male(s)/female
15–64 years: 1.02 male(s)/female
65 years and over: 0.71 male(s)/female

Италия:

At birth: 1.07 male/female
under 15 years: 1.06 male/female
15-64 years: 1.02 male/female
65 years and over: 0.72 male/female

США:

At birth: 1.048 male(s)/female
under 15 years: 1.04 male(s)/female
15-64 years: 1 male(s)/female
65 years and over: 0.75 male(s)/female

Россия:

at birth: 1.05 male(s)/female
under 15 years: 1.05 male(s)/female
15–64 years: 0.92 male(s)/female
65 years and over: 0.46 male(s)/female