Johannesburg - About a fifth of South African households live in state-subsidised homes, according to Statistics SA's general household survey (GHS) released on Thursday."At the time of the survey, 18.9% of South African households were living in 'RDP' or state-subsidised dwellings," Stats SA said. Of these, female households were more likely than their male counterparts to receive a government housing subsidy.Thirteen percent of respondents had at least one household member on a waiting list for an RDP home."In 2010, as in preceding years, female-headed households (11.1%) were more likely to receive a housing subsidy than male-headed households (8.8%)," the report said.However, some residents were concerned about the quality of these subsidised houses.Nationally, 17% said the walls were weak or very weak and 18% said the same of the roof.Stats SA found "considerable variation between provinces in the perceptions about housing quality".The most complaints came from the Western, Eastern and Northern Cape."Households in Gauteng and Mpumalanga seemed most content with the quality of their home's walls and roofs."The proportion of people living in informal dwellings appears unchanged between 2002 and 2010 at 13%.The GHS was conducted in July, August and September 2010 among 25 635 households in face-to-face interviews.It also found that the percentage of South Africans with a matric or Grade 12 education increased from 21.5% in 2002 to 26.2% in 2010.South Africa's population totalled 49.869 million in 2010 from 49.382 million in 2009.