Sampling errors Persons who have had casual partners in the last year. Variation coefficient by sex, age group and use of condom with casual partners. Units: % ;Total;Always;Not always; Both sexes; Total;2.91;3.88;4.86; From 18 to 29 years of age;3.84;5.00;6.73; From 30 to 39 years of age;5.45;7.85;8.17; From 40 to 49 years of age;6.71;9.43;9.83; Males; Total;3.25;4.56;5.62; From 18 to 29 years of age;4.22;5.99;7.65; From 30 to 39 years of age;5.95;8.75;9.22; From 40 to 49 years of age;7.99;10.91;12.08; Females; Total;5.60;7.06;9.20; From 18 to 29 years of age;7.22;8.48;12.83; From 30 to 39 years of age;12.09;16.12;18.20; From 40 to 49 years of age;12.82;20.42;16.72; Notes: Source: National Statistics Institute