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The Household Economic Survey has reported that expenditure by households on total medical goods for the year ended March 1997 increased 1 percent . I would argue that the intermediate step of weighting by household size does little to improve survey data . Fixed sprinkler systems were more likely to be used by dwelling owners or by households that had higher incomes . Gas Paid by Household : The household paid the utility company directly for all household uses of natural gas ( such as water heating , space heating , air-conditioning , cooking , and operating appliances , including outdoor gas lights ) . expenditure patterns by region visited , by age group and by household income are also included in the report . The types of heating used most often by households were gas heaters ( 34 % of households ) , reverse cycle air conditioners ( 26 % of households ) and electric heaters ( 18 % of households ) . Household participation in the decision making process is affected by household characteristics , community characteristics and outside factors . The energy prices paid by households , which are collected for the Consumers Price Index , are used for household energy price indexes . Moreover , some LDTs are held longer by households than are passenger cars , suggesting that household vehicle holdings may differ substantially in the coming years.13 As results reported above suggest , LDTs are driven significantly more miles each year and minivans serve substantially more person-trips than passenger cars .