5 est.)

Canada
at birth: 1.05 male(s)/female
under 15 years: 1.05 male(s)/female
15-64 years: 1.01 male(s)/female
65 years and over: 0.74 male(s)/female
total population: 0.98 male(s)/female (2005 est.)

Cape Verde
at birth: 1.03 male(s)/female
under 15 years: 1.02 male(s)/female
15-64 years: 0.94 male(s)/female
65 years and over: 0.6 male(s)/female
total population: 0.94 male(s)/female (2005 est.)

Cayman Islands
at birth: 1.02 male(s)/female
under 15 years: 1 male(s)/female
15-64 years: 0.95 male(s)/female
65 years and over: 0.89 male(s)/female
total population: 0.96 male(s)/female (2005 est.)

Central African Republic
at birth: 1.03 male(s)/female
under 15 years: 1.01 male(s)/female
15-64 years: 0.97 male(s)/female
65 years and over: 0.71 male(s)/female
total population: 0.98 male(s)/female (2005 est.)

Chad
at birth: 1.04 male(s)/female
under 15 years: 1.01 male(s)/female
15-64 years: 0.92 male(s)/female
65 years and over: 0.67 male(s)/female
total population: 0.95 male(s)/female (2005 est.)

Chile
at birth: 1.05 male(s)/female
under 15 years: 1.05 male(s)/female
15-64 years: 1 male(s)/female
65 years and over: 0.71 male(s)/female
total population: 0.98 male(s)/female (2005 est.)

China
at birth: 1.12 male(s)/female
under 15 years: 1.13 male(s)/female
15-64 years: 1.06 male(s)/female
65 years and over: 0.91 male(s)/female
total population: 1.06 male(s)/female (2005 est.)

Christmas Island
NA

Colombia
at birth: 1.03 male(s)/female
under 15 years: 1.02 male(s)/female
15-64 years: 0.95 male(s)/female
65 years and over: 0.79 male(s)/female
total population: 0.96 male(s)/female (2005 est.)

Comoros
at birth: 1.03 male(s)/female
under 15 years: 1.01 male(s)/female
15-64 years: 0.97 male(s)/female
65 years and over: 0.89 male(s)/female
total population: 0.99 male(s)/female (2005 est.)

Congo, Democratic Republic of the
at birth: 1.01 male(s)/female
under 15 years: 1.01 male(s)/female
15-64 years: 0.96 male(s)/female
65 years and over: 0.68 male(s)/female
total population: 0.98 male(s)/female (2005 est.)

Congo, Republic of the
at birth: 1.01 male(s)/female
under 15 years: 1.01 male(s)/female
15-64 years: 0.98 male(s)/female
65 years and over: 0.7 male(s)/female
total population: 0.98 male(s)/female (2005 est.)

Cook Islands
NA

Costa Rica
at birth: 1.05 male(