3.1 Demographics
The sample was confined to householders with a driving license and owning at least one car.
As a result, 92.6 percent of the sample consists of men and 63.2 percent of the sample is
Proceedings of the Eastern Asia Society for Transportation Studies, Vol.9, 2013
between 30 and 50 years old. Respondents with an annual household income of ¥4 to ¥8
million (approx USD 45,000 to 90,000) account for 51.2 percent of the sample. The
proportion of respondents with children that are under 19 years old is 49.2 percent and
households of more than three people account for 62.3 percent of all. The average car
ownership per household is 1.4. Since 87.6 percent of the respondents have a full-time job,
the frequency of car usage on both weekdays and at weekends is high, with the percentage of
those driving every weekday and every weekend reaching 62.2 and 48.3, respectively.
Regarding type of residence, 58.0 percent of the respondents live in detached houses, which
might provide them with a better situation for EV charging. Table 1 gives descriptive details
of the demographic information.