Censal Demography Survey by the Zimbabwe National Statistics Agency, 84% of Zimbabweans are Christian; 10% of the population do not belong to any religion, and 0.7% are Muslim. 62% of the population attend religious services regularly. 69% of Zimbabweans belong to Protestant Christianity, 8% are Roman Catholic. Pentecostal-charismatic forms of Christianity, in particular, have grown rapidly in recent years and are playing a prominent role in public, social and political life. The largest Christian churches are Anglican, Roman Catholic, Seventh-day Adventist and Methodist. As in other African countries, Christianity may be mixed with enduring traditional beliefs. Indigenous religion, which predates colonialism, has become relatively marginal but continues to be an important part of the Zimbabwean religious field. Ancestral worship is the most practised non-Christian religion, involving spiritual intercession; the mbira dzavadzimu, which means "voice of the ancestors", an instrument related to many lamellophones ubiquitous throughout Africa, is central to many ceremonial proceedings. Health At independence, the policies of racial inequality were reflected in the disease patterns of the black majority. The first five years after independence saw rapid gains in areas such as immunisation coverage, access to health care, and contraceptive prevalence rate. Zimbabwe was thus considered internationally to have achieved a good record of health development. Zimbabwe suffered occasional outbreaks of acute diseases. The gains on the national health were eroded by structural adjustment in the 1990s, the impact of the HIV/AIDS pandemic and the economic crisis since 2000. In 2006, Zimbabwe had one of the lowest life expectancies in the world according to UN figure—44 for men and 43 for women, down from 60 in 1990, but recovered to 60 in 2015. The rapid drop was ascribed mainly to the HIV/AIDS pandemic. Infant mortality rose from 6% in the late 1990s to 12.3% by 2004. Official fertility rates over the last decade were 3.6 (2002), 3.8 (2006) and 3.8 (2012). The 2014 maternal mortality rate per 100,000 births for Zimbabwe was 614 compared to 960 in 2010–11 and 232 in 1990. The under five mortality rate, per 1,000 births was 75 in 2014 (94 in 2009). The number of midwives per 1,000 live births was unavailable in 2016 and the lifetime risk of death for pregnant women 1 in 42. In 2006 an association of doctors in Zimbabwe made calls for Mugabe to make moves to assist the ailing health service. The HIV infection rate in Zimbabwe was