Table 1 Convenience quota sampling of the survey

Item 25~59 single 25~34 married 35~39 40~44 45~49 50~54 55~59 >60 Total
Seoul metropolitan area 14 45 47 42 47 49 46 32 322
Large city 22 29 36 28 30 32 27 26 230
Small and medium city 27 22 27 22 25 24 23 20 190
Total 63 96 110 92 102 105 96 78 742