Sampling errors Persons who have had more than one sexual partner in the last year. Variation coefficient by age group and sex. Units: % ;Both sexes;Males;Females; Total;2.34;3.14;4.02; From 18 to 29 years of age;3.27;4.23;5.32; From 30 to 39 years of age;4.71;5.81;8.36; From 40 to 49 years of age;6.29;8.01;10.35; Notes: Source: National Statistics Institute