Sampling errors Males who have had sexual relationships in the last year. Variation coefficient by age group and use of a prostitute in the last year. Units: % Total Yes No Total 1.47 6.89 1.58 From 18 to 29 years of age 2.40 10.56 2.47 From 30 to 39 years of age 2.62 10.04 2.74 From 40 to 49 years of age 2.79 13.68 2.97 Notes: Source: National Statistics Institute