Data available from 1947 to 1980 indicated that changes in marriage patterns had occurred in Thailand.* The trend toward increase in proportions of single and postponement of marriage in Thailand was similar to the situation found in many developing countries.7,15 Such changes were more obvious among males and females in the capital, Bangkok Metropolis. The highest average age at first marriage in 1980 was 25.9 years of age in Bangkok Metropolis, followed by 23.4 for the Central, 22.0 for the North, 21.9 for the South and 21.6 for the Northeast.